Предмет: Геометрия, автор: lalox022

Найдите значение выражения а) 4cos60+tg45
б) tg^2 30-2sin^2 45

Ответы

Автор ответа: onezuppi
0

а)

4 \times \frac{1}{2} + 1 = 2 + 1 = 3

б)

{( \frac{ \sqrt{3} }{3}) }^{2} - 2 \times {( \frac{ \sqrt{2} }{2}) }^{2} = \frac{3}{9} - 2 \times \frac{2}{4} = \frac{3}{9} - 1 = - \frac{2}{3}

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