drpropeter drpropeter

04-12-2017
Mathematics

contestada

Which is equal to sin 36°?
A) sin 54°
B) sin 64°
C) cos 54°
D) cos 64°

Respuesta :

apologiabiology apologiabiology

04-12-2017

remember, sin(|x|)=cos(|90-x|)
so sin(|36|)=cos(|90-36|)=cos(|54|)=cos(54)

answer is C

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issaspammingmoodfam issaspammingmoodfam

19-03-2020

The sine of an angle is equal to the cosine of its complement, and the complement of 36° is 90° – 36° = 54°. Therefore, cos 54° is equal to sin 36°.

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