find-the-value-sin-13pi-6-cos-49pi-4-

Question Number 69458 by mhmd last updated on 23/Sep/19

f i n d t h e v a l u e s i n (- 13 π / 6), c o s (49 π / 4)

Commented by kaivan.ahmadi last updated on 23/Sep/19

s i n (- 2 π - \frac{π}{6}) = s i n (- \frac{π}{6}) = - s i n (\frac{π}{6}) = - \frac{1}{2}

c o s (\frac{49 π}{4}) = c o s (12 π + \frac{π}{4}) = c o s (\frac{π}{4}) = \frac{\sqrt{2}}{2}