Question

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Answer 1

Ответ:

1.

$\cos(60°) + \sin(30°) = \frac{1}{2} + \frac{1} {2} = 1$

2.

$7 {tg}^{2} (45°) - 3 \sin(45°) = 7 \times {1}^{2} - 3 \times \frac{ \sqrt{2} }{2} = \\ = 7 - \frac{3 \sqrt{2} }{2}$

3.

$\sin( \frac{\pi}{4} ) \cos( \frac{\pi}{4} ) tg( \frac{\pi}{3} ) = \\ = \frac{ \sqrt{2} }{2} \times \frac{ \sqrt{2} }{2} \times \sqrt{3} = \\ = \frac{2}{4} \times \sqrt{3} = \frac{ \sqrt{3} }{2}$

4.

$\cos( \frac{3\pi}{2} ) - \sin( \frac{3\pi}{2} ) = 0 - ( - 1) = 1$