Question

(2) If
sin x + sina x = 1,
show that
cus² x + cos⁴ x = 1.

here deta = x I couldn't write it...​

Answer 1

Answer:

If

sin x + sina x = 1,

show that

cus² x + cos⁴ x = 1

Step-by-step explanation:

sin x + sin²x =1

sin x=1-sin²x

sin x=cos²x

(sin²x+cos²x=1)

LHS cos²x+(cos²x)

sin x + sin²x

so as given sin x +sin²x=1

so cos²x+cosx=1