Question

If cos A + cos² A = 1 then sin² A + sin⁴ A = ?

Options

• 1

• 2

• 3

• 4

Answer 1

1

Explanation:

cos A = (1 – cos² A) = sin² A.

∴ (sin² A + sin⁴ A) = (cos A + cos² A) = 1.