use the addition and subtraction formulas to simplify the experession sin(x+y)sin(x-y) write the answer in terms of sin x and cos y only
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Originally Posted by cm3pyro use the addition and subtraction formulas to simplify the experession sin(x+y)sin(x-y) write the answer in terms of sin x and cos y only $\displaystyle sin(a+b)=sin(a)cos(b)+sin(b)cos(a)$ and $\displaystyle sin(a-b)=sin(a)cos(b)-sin(b)cos(a)$...now apply that
i did ..but i am coming up with the worng answer.
Originally Posted by cm3pyro i did ..but i am coming up with the worng answer. well since I am sure you know that $\displaystyle a^2-b^2=(a+b)(a-b)$ we have that case here...except in reverse...so it should be $\displaystyle sin(a)^2cos(b)^2-sin(b)^2cos(a)^2$
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