Question

2sin^2b-5+2 cos^2b СРОЧНО!!!!!!!!!!!!!!!

Answer 1

$2sin^2 \beta - 5 + 2cos^2 \beta = 2(sin^2 \beta +cos^2 \beta )-5 = 2*1 - 5 = -3$

Answer 2

To simplify the expression 2sin^2(b) - 5 + 2cos^2(b), we can use the Pythagorean identity for trigonometric functions, which states that sin^2(x) + cos^2(x) = 1.

Applying this identity, we get:

2sin^2(b) + 2cos^2(b) - 5

Now, since sin^2(b) + cos^2(b) = 1, we can replace the sum with 1:

2(1) - 5

Now, simply evaluate the expression:

2 - 5 = -3

So, the simplified expression is -3.