Question

Помогите пожалуйста!

√18 - √72 *sin^2 ((5п)8)

Answer 1

√18(1 - 2$Sin^{2}(5Pi/8)</var><var>$)=3√2Cos(5Pi/4) = 3√2(-√2/2) = -3

 

1) 1 - 2sin^2(x)= cos 2x

2) 5Pi/4 = Pi + Pi/4, Cos(5Pi/4)=-cos(Pi/4)