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Amirul
Questions and answers by visitors named
Amirul
Questions (1)
sin 2 theta + cos theta = 0
so, we use sin 2 theta = 2 sin theta cos theta right? but the problem is i'm stuck on (2 sin theta
5 answers
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Answers (2)
Yeah, usually i used sinØ = -1/2 to find the quarters and skipped the negative to find theta. "if sinØ = -1/2, Ø must be in III or IV. Hence, Ø = 180+30 = 210° or 360-30 = 330°" However, i got the same answers as yours :). Just to make sure whether
i see you factorised the question. But, still i can't find the solution. but how about this: 2sin theta cos theta = - cos theta 2sin theta = - cos theta/cos theta 2sin theta = -1 sin theta = -1/2 theta = sin^-1(1/2) theta = 30
