Asked by sbonelo

if sin A = 3/5 and cos A is less than 0,determine the value of sin (-A)
Answered by Reiny
we know tht
sin (-Ø) = -sinØ

so if sinA = 3/5
sin(-A) = -3/5

check:
from the given, A = 143.13..
sin(-143.13..) = -.6
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