Tg 3p/4+cos 5p/3 * sin 7p/6 - (sin 2p/3)^2

Question

Tg 3p/4+cos 5p/3 * sin 7p/6 - (sin 2p/3)^2

Answer 1

Tg(3π/4) +cos(5π/3)·sin(7π/6) - (sin(2π/3))² = 
= -1+ ¹/₂·(-¹/₂) - (√3/2)² = -1- ¹/₄ -³/₄ = -2