It is depends what you mean by saying simplify...Sometimes it can be beneficial to use this identity:$cos(x) cos(y) = frac12 left< cos(x+y) + cos(x-y) ight>$Usually girlfriend can change trigonometric role multiplication to sum or backwards.
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Multiplication of any type of two attributes with various variables cannot be simplified into one function of one variable. This kind of leveling is very rare:
(1) $f(x)f(y)=g(xy)$
Examples of duty that fulfill (1) is $f(x)=ax$ or $f(x)=ax^n$.Other role that fulfill (1) most likely esoteric...
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simplifying $frac4sqrt73cosleft(frac13arccosfrac1sqrt28 ight)+frac13$
simple $cot(eta - gamma)cot(gamma - alpha) + cos(gamma - alpha)cos(alpha - eta) + cos(alpha - eta)cot(eta - gamma) $
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