Question

what is the formula of 1+cosx ​

Answer 1

Answer:

1+cosx = 2cos^2(x/2)

Step-by-step explanation:

cos2A= 2cos^2(A) - 1

So, 1+cos2A = 2cos^2(A)

By putting, x in place of 2A, we get,

1+cosx = 2cos^2(x/2)