if sin A = 3/5 and cos A is less than 0,determine the value of sin (-A)
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
sin (-Ø) = -sinØ
so if sinA = 3/5
sin(-A) = -3/5
check:
from the given, A = 143.13..
sin(-143.13..) = -.6