Hey guys can you prove this identity for me and please tell me how you do it. Since its my first time proving identites, I have no idea what to do. Sin theta + Sin 2 theta ________________________ = Tan theta 1 + Cos theta + Cos 2 theta Thanks
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Originally Posted by itsMoeyy Hey guys can you prove this identity for me and please tell me how you do it. Since its my first time proving identites, I have no idea what to do. Sin theta + Sin 2 theta ________________________ = Tan theta 1 + Cos theta + Cos 2 theta Thanks ------------------------------------------- so -------------------------------------- Fraction now becomes ___________________ things in blue are formulas things in red get canceled
Where are the formula's from?
Originally Posted by itsMoeyy Where are the formula's from? They are standard formulae called the double angle formulae. Look for them in your class notes or textbook.
Ok, but how do you put the formula's into place? Like do you subtitute them into the equation. But how?
Originally Posted by itsMoeyy Ok, but how do you put the formula's into place? Like do you subtitute them into the equation. But how? You substitute one expression for the other. eg. Replace with etc.
Last edited by mr fantastic; April 30th 2009 at 01:45 PM.
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