Question

How do you prove sinθ=0 and cosθ=1?

Answer 1

Answer:

If sinθ=0,cosθ=±1

Explanation:

I am answering the question "If sinθ=0, prove cosθ=±1?"

Use cosθ=±√1−sin2θ=±√1−0=±1

The general solution of sinθ=0 is

nπ,n=0,+=1,±2,±3,...

So cosθ=cosnπ=(−1)n

=1, for n=0,±2,±4.±6,...and

=−1, for n=±1,±3,±5,..

Answer 2

Answer:

Step-by-step explanation:

We can prove it by putting angle 0degree in theta.......it is as folows..

Sinθ=0 then sin(0)degre=0

Cos (0) =1