Question

If sin 0 + sino - 1. prove: cos' 0 + cos 0 - 1​

Answer 1

Step-by-step explanation:

this may helps you......

Answer 2

Step-by-step explanation:

Your question has wrong info but I am assuming you are asking the question

If sin^2theta + sintheta=1

then prove that Cos^4 theta + cos^2theta=1

Answer

sin^2theta -1=sintheta

cos^2theta= sintheta (using the identity)

Let the equation above be equation 1

Substituting equation 1 in Cos^4 theta + cos^2theta we get

Sin^2theta + sintheta

we already know that this is equal to one as it is given in the question so

Cos^4 theta + cos^2theta=1

And hence proved