07-02-2017
Mathematics

Answered

Find ϴ in the equation sin(ϴ + 15) = cos(2ϴ)

A50
B75
C25
D40

Verified Answer :

Nirina7 Nirina7

14-02-2017

the answer is c. 25

sin(ϴ + 15) = cos(2ϴ)
sin(ϴ + 15) =sin(25 + 15) =sin(40) =0.64
cos(2ϴ)=cos(2x25)=cos(50)=0.64
so ϴ=25

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