Question

PelamordeDeusmeajudeeeeeeeeeeeeem

Determine:

a)- cos $9 \pi \\ 2$ 

b)- sen $45 \pi \\ 2$

Answer 1

a)
cos$\frac{9}{2} \pi = \frac{8 \pi }{2} + \frac{ \pi }{2} =4 \pi + \frac{ \pi }{2}$

cos$\frac{9}{2} \pi = cos \frac{ \pi }{2}$

$cos \frac{ \pi }{2} =0$

b)
$sen \frac{45}{2} \pi = \frac{44 \pi }{2} + \frac{ \pi }{2} =22 \pi + \frac{ \pi }{2}$

$sen \frac{45 \pi }{2} = sen \frac{ \pi }{2}$

$sen \frac{ \pi }{2} =1$