sinA / (1+cosA) = tan 0.5A
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Hello, Punch! We need a few identities: . Prove: . The right side is: . Multiply by Therefore: .
Originally Posted by Soroban Hello, Punch! We need a few identities: . \cos^2\!\frac{A}{2} &=& \dfrac{1+\cos A}{2} && \Rightarrow && \cos\frac{A}{2} &=& \dfrac{1+\cos A}{2}\end{array}" alt=" \cos^2\!\frac{A}{2} &=& \dfrac{1+\cos A}{2} && \Rightarrow && \cos\frac{A}{2} &=& \dfrac{1+\cos A}{2}\end{array}" /> The right side is: . Multiply by Therefore: . Hello! Thanks a lot thank you very much!
lol Soroban, guess you can explain it better than me. http://www.mathhelpforum.com/math-he...-identity.html
Just a question, do we need the memorize all the formulas, or the formulas are given in the formula sheet during the examination?
Originally Posted by Punch Just a question, do we need the memorize all the formulas, or the formulas are given in the formula sheet during the examination? It up to the teacher. He or she may let you use a formula sheet or you may have to memorize them. You could also learn to derive them.
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