What is the value of x? sin(x+21)°=cos(2x+21)°

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asked Sep 4, 2019 131k views

1 Answer

Boyet · Answer 1 · 2019-09-10T05:57:09+0000

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

in this problem
(x+21)+(2x+21)=90-------> 3x+42=90-------> 3x=48-----> x=16°

What is the value of x? sin(x+21)°=cos(2x+21)°

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