IfH cos findH andHSolutionH sin cos H cos 2sin

IfH(?) =?cos?, findH\'(?) andH\'\'(?).

H\'() = (-sin) + cos

H\'\'() = -cos - 2sin

$IfH(?) =?cos?, findH\'(?) andH\'\'(?).SolutionH\'() = (-sin) + cos H\'\'() = -cos - 2sin$