Question

Найдите значение выражения, если x=п/6 8*(sin^2*x-cos^2*x)

Answer 1

X = pi/6; 
 8(sin^2 x - cos^2 x) = - 8(cos^2 x - sin^2 x) = - 8*cos(2 x)=
= - 8 *cos(2*pi/6) = - 8* cos(pi/3) = - 8 * 1/2 = - 4