Question

solve it with full step wise explain it.​

Answer 1

Hey

Given :-

Cos^2@ + 2sin^2@ = 2

2sin^2@ can be written as sin^2@ + sin^2@

cos^2@ + sin^2@ + sin^2@ = 2

We know that sin^2@ + cos^2@ = 1

1 + sin^2@ = 2

sin^2@ = 2 - 1

sin^2@ = 1

Thus

@ = 90°