64.FIND X IF COS 3X + SIN(2x - 7pi/6)= -2

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f (x) = ∣ ∣ ∣ ∣ \begin{matrix} cos x & sin x & cos x cos 2 x & sin 2 x & 2 cos 2 x cos 3 x & sin 3 x & 3 cos 3 x \end{matrix} ∣ ∣ ∣ ∣

f^{'} (\frac{π}{2}) =

{log}_{\frac{- x^{2} - 6 x}{10}} (sin 3 x + sin x) = {log}_{\frac{- x^{2} - 6 x}{10}} (sin 2 x)

∣ ∣ ∣ ∣ ∣ \begin{matrix} 1 + {sin}^{2} x & {cos}^{2} x & 4 sin 2 x {sin}^{2} x & 1 + {cos}^{2} x & 4 sin 2 x {sin}^{2} x & {cos}^{2} x & 1 + 4 sin 2 x \end{matrix} ∣ ∣ ∣ ∣ ∣ =

\frac{d y}{d x}

f (x) = cos 3 x .6 e^{6 x}

\sqrt{c o s 2 x} + \sqrt{(1 + s i n 2 x)} = 2 \sqrt{(s i n x + c o s x)}

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