SOLUTION: express sin (-400) in terms of sin 40

Algebra ->  Trigonometry-basics -> SOLUTION: express sin (-400) in terms of sin 40      Log On


   

Question 1085769: express sin (-400) in terms of sin 40
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+-400+=+-360+-+40+
+sin%28+-400+%29+=+sin%28+-40+%29+
In the 4th quadrant, the sine function is negative
In the 1st quadrant, the sine function is positive
+sin%28-40%29+=+-sin%2840%29+
and, from my 2nd line here:
+sin%28-400%29+=+-sin%2840%29+