how to tell in a trigonometry question which sin, cos, or tan to use to find a side or an angle

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you have to see the final form! for example : prove than sin2a+cosa+tana= sina

en example! you see that in the final form there is half the angle.. there isnt 2a... only a.. also there arent any cos or tan ! so you have to bring it to that form
by Level 1 User (420 points)

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