Question

4. Обчисліть: 1) tg (-45°) + sin 180° =

3) sin(-30°) = 4) cos 405°=​

Answer 1

Ответ:

tg (-45°) = -1 and sin 180° = 0, so tg (-45°) + sin 180° = -1 + 0 = -1.

sin(-30°) = -0.5

cos 405° = cos (360° + 45°) = cos 45° = 1/√2 or approximately 0.707