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

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

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Question 1085769: express sin (-400) in terms of sin 40
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!

In the 4th quadrant, the sine function is negative
In the 1st quadrant, the sine function is positive

and, from my 2nd line here:

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