Asked by Bishal
(Cos40-sin30)/(sin60-cos50)
Answers
Answered by
Steve
recall your sum formulas.
cos40-sin30 = cos40-cos60 = 2 sin50 sin10
sin60-cos50 = cos30-cos50 = 2 sin40 sin10
so, you end up with sin50/sin40
cos40-sin30 = cos40-cos60 = 2 sin50 sin10
sin60-cos50 = cos30-cos50 = 2 sin40 sin10
so, you end up with sin50/sin40
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