Question

3) If sin(theta+36)=cos theta, find theta

Answer 1

sin(theta+36) =cos(theta)
sin(theta+36) =sin(90-theta)
2 X theta =90-36
theta = 27

Answer 2

Hello !
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Sin (Ф + 36 ) = cos Ф

Sin (Ф + 36 ) = sin( 90 - Ф ) 

NOW,

Ф + 36 = 90 - Ф

Ф + Ф  = 90 - 36 

2Ф       = 54

Ф         = 27°
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