General Discussion Undecided where to post - do it here. |
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From most basic trigonometric equation:
cos**2 + sin**2 = 1 you can deduct -> cos**2 = 1 - sin**2 -> cos**2 = (1-sin)(1+sin) -> 1+sin = cos**2 / (1-sin) by definition: sec = 1/cos tan = sin/cos So your left expression: -> 1/(1/cos + sin/cos) -> 1/((1+sin)/cos) -> cos/(1+sin) replace 1+sin with the expression above -> cos/(cos**2 / (1-sin) ) -> (1-sin)/cos -> 1/cos - sin/cos -> sec - tan |
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