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a)sin 30°- cos 60°- cos² 120° +sin 135° ×cos 90°
б)tg 30°×tg60°-tg²135°+cos150°
a)sin 30°- cos 60°- cos² 120° +sin 135° ×cos 90°
б)tg 30°×tg60°-tg²135°+cos150°
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б)tg30°×tg60°-tg^2 135°+cos150°=1/√3×√3+tg45°-cos60°=1+1-1/2=1.5