Question

(cos 2 a+ sin 2a)^2-1Помогите решить​

Answer 1

Сокращение, Всё поэтапно прописанно

Answer 2

Sure, I can help you simplify the expression (cos^2a + sin^2a)^2 - 1.

In trigonometry, we know that cos^2(a) + sin^2(a) = 1. This identity is known as the Pythagorean identity. Let's substitute this value into the expression:

(cos^2a + sin^2a)^2 - 1 = (1)^2 - 1

Now, simplify the expression further:

(1)^2 - 1 = 1 - 1 = 0

So, the simplified expression is 0.