Question

Calcule o valor de: podem me ajudar alguem:

Answer 1

$a) \\ sen~540^\circ\mapsto sen~180^\circ=0 \\ \\ b) \\ sen \frac{~9 \pi }{2} \mapsto~sen \frac{ \pi }{~2} =1 \\ \\ \frac{8 \pi }{2} + \frac{ \pi }{2} =4 \pi + \frac{x}{y} \\ \\ c) \\ sen~-330^\circ\mapsto~sen~30^\circ= \frac{1}{2} \\ \\ d) \\ cos \frac{~3 \pi }{2}\mapsto cos \frac{ \pi }{2} =0 \\ \\ \frac{2 \pi }{2} + \frac{ \pi }{2} = \pi + \frac{ \pi }{2} \\ \\ e) \\ cos \frac{~25 \pi }{6} \mapsto cos \frac{ \pi }{6} \mapsto cos30^\circ= \frac{ \sqrt{3} }{2}$  

$\frac{24 \pi }{6} + \frac{ \pi }{6} =4 \pi + \frac{ \pi }{6} \\ \\ f) \\ cos-1020^\circ\mapsto cos~60^\circ= \frac{1}{2}$