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If sin (3x+2) = cos (6x+7), then what is the value of x? a) 1 b) 4 c) 9 d) 19
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If sin (3x+2) = cos (6x+7), then what is the value of x?

a) 1
b) 4
c) 9
d) 19

User Alek Depler
by
7.6k points

1 Answer

4 votes
we know that
if sin A=cos B
then
A+B=90°
A and B are complementary angles

therefore
(3x+2)+(6x+7)=90--------> 9x+9=90------> 9x=90-9----> x=81/9----> x=9°

the answer is
x=9
User Sergiy Sokolenko
by
8.2k points
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