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Rohit Jha

Jul 15, 2014

Sin 10 Sin 30 Sin 50 sin 70 = 1/16

This answer has an image. Please click on the question to read more.

Kishore Kumar

Feb 2, 2014

If A+B+C=180 degree then prove that tanB.tanC + tanC.tanA + tanA.tanB = 1 + secA.secB.secC

This answer has an image. Please click on the question to read more.

Rohit Jha

Jul 15, 2014

4. sin 600 * tan (-690) + sec 840 * cot(-945)

Given : Sin 600Â° * Tan (-690Â°) + Sec 840Â° * Cot(-945Â°)

= Sin 600Â° x -Tan 690Â° + Sec 840Â° x -Cot 945&d...

P Murali Krishna

May 3, 2015

Find the value of cos(Ï€/5) cos(2Ï€/5) cos(4Ï€/5) cos(8Ï€/5)

Given cos(Ï€/5) cos(2Ï€/5) cos(4Ï€/5) cos(8Ï€/5) [ multiply and divide by 2sin(Ï€/5) ]

â‡’ 2sin(Ï€/5)cos(Ï€/5) cos(2Ï€/5) cos(4Ï€/5) cos(8Ï€...

â‡’ 2sin(Ï€/5)cos(Ï€/5) cos(2Ï€/5) cos(4Ï€/5) cos(8Ï€...

Rejitha Krishnan RG

Aug 23, 2014

prove that: cosÏ€/7*cos2Ï€/7*cos4Ï€/7=-1/8

Sol:

Given cosÏ€ / 7 cos2Ï€/ 7 cos4Ï€/ 7 [ Multiply and divided by 2 Sin Ï€ / 7 ]

â‡’ 2Sin Ï€ / 7 cosÏ€ / 7 cos2Ï€/ 7 cos4Ï€/ 7 / 2 Sin...

Given cosÏ€ / 7 cos2Ï€/ 7 cos4Ï€/ 7 [ Multiply and divided by 2 Sin Ï€ / 7 ]

â‡’ 2Sin Ï€ / 7 cosÏ€ / 7 cos2Ï€/ 7 cos4Ï€/ 7 / 2 Sin...

Saba Hussain

Jun 7, 2014

Urgent!

Sol :

Given that Tan^{3} x - 3 Tan x = 0

â‡’ 3 Tan x - Tan^{3} X = 0

We know that Tan 3x = (3 Tan x - Tan^{3} x) / ( 1 - 3 Tan^{2} x)

Given that Tan

â‡’ 3 Tan x - Tan

We know that Tan 3x = (3 Tan x - Tan

Rohit Jha

Jul 15, 2014

2. If tan 35 = x then Prove that

tan 145 - tan 125 /1+ tan 145 * tan 125 = 1-x2/2x

tan 145 - tan 125 /1+ tan 145 * tan 125 = 1-x2/2x

Sol :

Given that Tan 35 = x

â‡’ T

Given that Tan 35 = x

â‡’ T

Kahan Mehta

Aug 6, 2014

If 3sinx - 5cosx = a, then 5sinx + 3cosx is equal to ?

Sol:

Given 3 Sinx - 5 Cosx = a squearing on both sides

9 Sin^{2} x + 25 Cos^{2 }x - 30 Sin x Cos x = a^{2} ---------------(1)

Let 5 Sin x...

Given 3 Sinx - 5 Cosx = a squearing on both sides

9 Sin

Let 5 Sin x...

Jahnavi

Jun 18, 2014

In a triangle ABC, if a cosA = b cos B, then it is which type of triangle?

Sol:

Given a cosA = b cos B

2R Sin A Cos A = 2R Sin B Cos B.

2 Sin A Cos A = 2 Sin B Cos B.

Sin 2A = Sin 2B

2A = 2B

A = B.

An isosceles triangle is a triangle wi...

Given a cosA = b cos B

2R Sin A Cos A = 2R Sin B Cos B.

2 Sin A Cos A = 2 Sin B Cos B.

Sin 2A = Sin 2B

2A = 2B

A = B.

An isosceles triangle is a triangle wi...

Rejitha Krishnan RG

Sep 11, 2014

if y=2sinx /(1+cosx+sinx) then (1-cosx+sinx)/(1+sinx) =

a)1+y

b)1-y

c)1/y

d)y

Sol :

Given y = 2sinx /(1+cosx+sinx) rationalize with (1 - cos x + sin x)

â‡’ y = 2sin x(1 - cos x + sin x) / (1 + cos x + sinx)(1 - cos x + sin x)

â‡’ y = 2sin x(1 ...

Given y = 2sinx /(1+cosx+sinx) rationalize with (1 - cos x + sin x)

â‡’ y = 2sin x(1 - cos x + sin x) / (1 + cos x + sinx)(1 - cos x + sin x)

â‡’ y = 2sin x(1 ...

Rohit Jha

Jul 15, 2014

Sin 10 Sin 30 Sin 50 sin 70 = 1/16

This answer has an image. Please click on the question to read more.

Kishore Kumar

Feb 2, 2014

If A+B+C=180 degree then prove that tanB.tanC + tanC.tanA + tanA.tanB = 1 + secA.secB.secC

This answer has an image. Please click on the question to read more.

Rohit Jha

Jul 15, 2014

4. sin 600 * tan (-690) + sec 840 * cot(-945)

Given : Sin 600Â° * Tan (-690Â°) + Sec 840Â° * Cot(-945Â°)

= Sin 600Â° x -Tan 690Â° + Sec 840Â° x -Cot 945&d...

P Murali Krishna

May 3, 2015

Find the value of cos(Ï€/5) cos(2Ï€/5) cos(4Ï€/5) cos(8Ï€/5)

Given cos(Ï€/5) cos(2Ï€/5) cos(4Ï€/5) cos(8Ï€/5) [ multiply and divide by 2sin(Ï€/5) ]

â‡’ 2sin(Ï€/5)cos(Ï€/5) cos(2Ï€/5) cos(4Ï€/5) cos(8Ï€...

â‡’ 2sin(Ï€/5)cos(Ï€/5) cos(2Ï€/5) cos(4Ï€/5) cos(8Ï€...

Rejitha Krishnan RG

Aug 23, 2014

prove that: cosÏ€/7*cos2Ï€/7*cos4Ï€/7=-1/8

Sol:

Given cosÏ€ / 7 cos2Ï€/ 7 cos4Ï€/ 7 [ Multiply and divided by 2 Sin Ï€ / 7 ]

â‡’ 2Sin Ï€ / 7 cosÏ€ / 7 cos2Ï€/ 7 cos4Ï€/ 7 / 2 Sin...

Given cosÏ€ / 7 cos2Ï€/ 7 cos4Ï€/ 7 [ Multiply and divided by 2 Sin Ï€ / 7 ]

â‡’ 2Sin Ï€ / 7 cosÏ€ / 7 cos2Ï€/ 7 cos4Ï€/ 7 / 2 Sin...

Saba Hussain

Jun 7, 2014

Urgent!

Sol :

Given that Tan^{3} x - 3 Tan x = 0

â‡’ 3 Tan x - Tan^{3} X = 0

We know that Tan 3x = (3 Tan x - Tan^{3} x) / ( 1 - 3 Tan^{2} x)

Given that Tan

â‡’ 3 Tan x - Tan

We know that Tan 3x = (3 Tan x - Tan

Rohit Jha

Jul 15, 2014

2. If tan 35 = x then Prove that

tan 145 - tan 125 /1+ tan 145 * tan 125 = 1-x2/2x

tan 145 - tan 125 /1+ tan 145 * tan 125 = 1-x2/2x

Sol :

Given that Tan 35 = x

â‡’ T

Given that Tan 35 = x

â‡’ T

Kahan Mehta

Aug 6, 2014

If 3sinx - 5cosx = a, then 5sinx + 3cosx is equal to ?

Sol:

Given 3 Sinx - 5 Cosx = a squearing on both sides

9 Sin^{2} x + 25 Cos^{2 }x - 30 Sin x Cos x = a^{2} ---------------(1)

Let 5 Sin x...

Given 3 Sinx - 5 Cosx = a squearing on both sides

9 Sin

Let 5 Sin x...

Jahnavi

Jun 18, 2014

In a triangle ABC, if a cosA = b cos B, then it is which type of triangle?

Sol:

Given a cosA = b cos B

2R Sin A Cos A = 2R Sin B Cos B.

2 Sin A Cos A = 2 Sin B Cos B.

Sin 2A = Sin 2B

2A = 2B

A = B.

An isosceles triangle is a triangle wi...

Given a cosA = b cos B

2R Sin A Cos A = 2R Sin B Cos B.

2 Sin A Cos A = 2 Sin B Cos B.

Sin 2A = Sin 2B

2A = 2B

A = B.

An isosceles triangle is a triangle wi...

Rejitha Krishnan RG

Sep 11, 2014

if y=2sinx /(1+cosx+sinx) then (1-cosx+sinx)/(1+sinx) =

a)1+y

b)1-y

c)1/y

d)y

Sol :

Given y = 2sinx /(1+cosx+sinx) rationalize with (1 - cos x + sin x)

â‡’ y = 2sin x(1 - cos x + sin x) / (1 + cos x + sinx)(1 - cos x + sin x)

â‡’ y = 2sin x(1 ...

Given y = 2sinx /(1+cosx+sinx) rationalize with (1 - cos x + sin x)

â‡’ y = 2sin x(1 - cos x + sin x) / (1 + cos x + sinx)(1 - cos x + sin x)

â‡’ y = 2sin x(1 ...