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Inverse Trigonometric Functions
Inverse Trigonometric Functions
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Question

If a=sin1(sin(5))a=\sin ^{-1}(\sin (5)) and b=cos1(cos(5))b=\cos ^{-1}(\cos (5)), then a2+b2a^2+b^2 is equal to

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Solution

a=sin1(sin5)=52π and b=cos1(cos5)=2π5a2+b2=(52π)2+(2π5)2=8π240π+50\begin{aligned} & a=\sin ^{-1}(\sin 5)=5-2 \pi \\ & \text { and } b=\cos ^{-1}(\cos 5)=2 \pi-5 \\ & \therefore a^2+b^2=(5-2 \pi)^2+(2 \pi-5)^2 \\ & =8 \pi^2-40 \pi+50 \end{aligned}

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