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OpenStudy (anonymous):
Which value of x solves the equation cos x° = sin (20° + x°), where 0 < x < 90?
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OpenStudy (anonymous):
A: 30° B: 35° C: 40° D: 45° E: 55° @iGreen. @AnswerMyQuestions @Legends
OpenStudy (anonymous):
I found the solution online but I'm not quite sure how they got it; sin(90 - x) = sin(20 + x) 90 - x = 20 + x 2x = 70 x = 35 degs
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