sin30°-cos60°-cos^2 120°+sin135°×cos90°=1/2×1/2-(-1/2)^2+0.5√2×0=1/4-1/4=0
tg30°×tg60°-tg^2 135°+cos150°=1/√3×√3+tg45°-cos60°=1+1-1/2=1.5
Объяснение:
sin30°-cos60°-cos^2 120°+sin135°×cos90°=1/2×1/2-(-1/2)^2+0.5√2×0=1/4-1/4=0
tg30°×tg60°-tg^2 135°+cos150°=1/√3×√3+tg45°-cos60°=1+1-1/2=1.5
Объяснение: