Question

Cos 4 theta + sin 4 theta + 2 sin square theta cos square theta equal to 1

Answer 1

Answer:

If you know the identity (a+b)2 = a2+b2+2ab

Step-by-step explanation:

cos4A+sin4A+2sin2Acos2A=1

LHS

• (cos2A)2 + (sin2A)2 + 2(sin2A)(cos2A)
• (cos2A +sin2A)
• 1

RHS

1