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1. Cotangent of an inverse trigonometric sum ●●○○○ 20 ptsIf $\cot\left(\cos^{-1}\frac{3}{5}+\sin^{-1}x\right)=0$, find the value of $x$. Give your answer as a decimal.
2. Area of a regular pentagon from perimeter ●●○○○ 20 ptsA regular pentagon has perimeter $85$ cm. Find its area in square centimetres. Round to the nearest square centimetre.