Question

Prove that - Sin^2A = 2sinA 8 cos A

Answer 1

Answer:

If A=30°,

sin2A=2sinAcosA

sin(2×30°)=2sin30°cos30°

sin60°=2sin30°cos30°

2

3

=2×

2

1

×

2

3

2

3

=

2

3

∴LHS=RHS