April 18, 2016

Can you simplify this? (Trigonometry)?


how do you reach a solution?? I was thinking you can use the trig identity tanx=sinx/cosx, but I’m not sure. Please help! Thanks!



sin(?+?)= -sin? => horizontal shift left ?
cos([?/2]-?) = sin? => co-function
=-sin? / sin?
= -1

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