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JEE Mains · Maths · STD 12 - 2. inverse trigonometric function

જો \(\mathrm{a}=\sin ^{-1}(\sin (5))\) અને \(\mathrm{b}=\cos ^{-1}(\cos (5))\) , તો \(\mathrm{a}^2+\mathrm{b}^2 =\) ...........

  1. A \(4 \pi^2+25\)
  2. B \(8 \pi^2-40 \pi+50\)
  3. C \(4 \pi^2-20 \pi+50\)
  4. D \(25\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(8 \pi^2-40 \pi+50\)

Step-by-step Solution

Detailed explanation

\(a=\sin ^{-1}(\sin 5)=5-2 \pi \) \(\text { and } b=\cos ^{-1}(\cos 5)=2 \pi-5 \) \(\therefore a^2+b^2=(5-2 \pi)^2+(2 \pi-5)^2 \) \(=8 \pi^2-40 \pi+50\)
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