Trig Questions (1 Viewer)

[munkaii]

CAn someone prove these for me?

(sin 5A)^2 - (sin3A)^2 = sin8Asin2A

(1+sin2A)/(1-sin2A)= tan^2 (45+A)

tan3x-tanx=2sinx/cos3x

For the sake of the world i cant prove them

 

[maths > english]

Solution to the first one attached

 

[maths > english]

Solution to 2 attached

 

[maths > english]

Solution to 3 attached

 

[munkaii]

thanks a heap