Question
Solve the following equations:
$\cos\text{x}+\sin\text{x}=\cos2\text{x}+\sin2\text{x}$
$\cos\text{x}+\sin\text{x}=\cos2\text{x}+\sin2\text{x}$
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Find the coefficient of:
x9 in the expansion of $\Big(\text{x}^2-\frac{1}{3\text{x}}\Big)^{9}.$