Monday, 22 July 2013

algebra precalculus - Prove that frac2sin(a)+sec(a)1+tan(a) = frac1+tan(a)sec(a)





Prove that 2sin(a)+sec(a)1+tan(a) = 1+tan(a)sec(a)






My attempt using the LHS



2sin(a)+sec(a)1+tan(a)



2sin(a)+1cos(a)1+sin(a)cos(a)



2sin(a)+1cosacos(a)+sin(a)cos(a)



2sin(a)+1cosacos(a)cos(a)+sin(a)




2sin(a)+1cos(a)+sin(a)



Now I am stuck...


Answer



Hint: What does (cosa+sina)2 simplify to?


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