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In this image it states 0.5cos70 = 0.5a. I find it hard to understand how they've derived that, given sin =opp/hyp, cos = adj/hyp and tan = opp/adj. referring to the image - in trig we're taught the longest side is the hyp, and opposite the angle is opposite, and the last is obviously adjacent; understood. In order to find opposite in this diagram; surely we'd use tan=opp/adj, but this is wrong, please help me understand why?