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03-05-2018
Mathematics

contestada

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

Respuesta :

calculista calculista

17-05-2018

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°

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