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Answer:

Step-by-step explanation:
<u><em>The question is </em></u>
Find the value of x
we know that
If sin(A)=cos(B)
then
angle A and angle B are complementary angles
so

In this problem

so

solve for




I hope this helps you
x^2-x-72=0
x -9
x +8
(x-9)(x+8)=0
x=9
x= -8