Вычислите значение выражений:
1).sin30°×cos60°-cos² 120°+sin135°×cos90°
2).tg30°×tg60°-tg²135°+cos150°
1).sin30°×cos60°-cos² 120°+sin135°×cos90°
2).tg30°×tg60°-tg²135°+cos150°
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Answers & Comments
1) 1/2 * 1/2 - (-1/2) + sqrt(2)/2 * 0 = 0.75
2) 1/sqrt(3) * sqrt(3) - 1^2 + -sqrt(3)/2 =