Math, asked by rekharoychowdhu, 1 year ago

Plzz solve it for me
sin(7 theta+9)=cos2theta

Answers

Answered by sasr2210

1

SinA= CosB ,,
only when angles A+B=90°

therefore,, Sin(7theta+9)= Cos(2theta)

implies
7theta+9+2theta=90°
9theta = 81°
theta=81/9=9°

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