Question

. If sin A + sin2 A = 1, then cos2 A + cos4 A = ?

(a) 1 (b) 0 (c) 2 (d) 4​

Answer 1

$\boxed{\bf{\red{\bigstar Answer: }}}$

• $sin \: a \: + {sin}^{2} a = 1$
• Sin A = Cos^2 A
• Sin^2 A = Cos^4 A
• Replace this value in Question we get:
• cos^2 A + Sin^2 A = 1