∠A and ∠
B
∠B are supplementary angles. If m
∠
A
=
(
6
x
+
10
)
∘
∠A=(6x+10)
∘
and m
∠
B
=
(
4
x
+
30
)
∘
∠B=(4x+30)
∘
, then find the measure of
∠
B
∠B.

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Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b