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JEE Advanced 2026Paper 1
Exam
JEE Advanced
Year
2026
Paper
Paper 1
Subject
Mathematics
Chapter
Inverse Trigonometric Functions

JEE Advanced 2026 · Paper 1 · Mathematics · Inverse Trigonometric Functions

Considering only the principal values of the inverse trigonometric...

Considering only the principal values of the inverse trigonometric functions, the value of

cot⁡−1(cot⁡(−11))+10sin⁡(2cos⁡−1(12))+10sin⁡(2tan⁡−1(2))\cot^{-1}(\cot(-11)) + 10 \sin\left(2 \cos^{-1}\left(\dfrac{1}{\sqrt{2}}\right)\right) + 10 \sin(2 \tan^{-1}(2))

is

Options

  1. A3π+73\pi + 7
  2. B77
  3. C4π+74\pi + 7
  4. D3π−53\pi - 5

Correct answer

C. 4π+74\pi + 7

Step-by-step solution

For the first term, cot⁡−1(cot⁡(−11))\cot^{-1}(\cot(-11)):
The principal value branch of cot⁡−1(x)\cot^{-1}(x) is (0,π)(0, \pi).
Since the cotangent function is periodic with period π\pi, cot⁡(−11)=cot⁡(−11+4π)\cot(-11) = \cot(-11 + 4\pi).
Using π≈3.14\pi \approx 3.14, we have 4π≈12.564\pi \approx 12.56, so −11+4π≈1.56-11 + 4\pi \approx 1.56, which lies in the interval (0,π)(0, \pi).
Thus, cot⁡−1(cot⁡(−11))=4π−11\cot^{-1}(\cot(-11)) = 4\pi - 11.

For the second term, 10sin⁡(2cos⁡−1(12))10 \sin\left(2 \cos^{-1}\left(\dfrac{1}{\sqrt{2}}\right)\right):
Since cos⁡−1(12)=π4\cos^{-1}\left(\dfrac{1}{\sqrt{2}}\right) = \dfrac{\pi}{4}, we get:
10sin⁡(2×π4)=10sin⁡(π2)=10(1)=1010 \sin\left(2 \times \dfrac{\pi}{4}\right) = 10 \sin\left(\dfrac{\pi}{2}\right) = 10(1) = 10.

For the third term, 10sin⁡(2tan⁡−1(2))10 \sin(2 \tan^{-1}(2)):
Let θ=tan⁡−1(2)⇒tan⁡(θ)=2\theta = \tan^{-1}(2) \Rightarrow \tan(\theta) = 2.
Using the multiple angle formula sin⁡(2θ)=2tan⁡(θ)1+tan⁡2(θ)\sin(2\theta) = \dfrac{2\tan(\theta)}{1 + \tan^2(\theta)}, we obtain:
sin⁡(2θ)=2(2)1+22=45\sin(2\theta) = \dfrac{2(2)}{1 + 2^2} = \dfrac{4}{5}.
Therefore, 10sin⁡(2tan⁡−1(2))=10×45=810 \sin(2 \tan^{-1}(2)) = 10 \times \dfrac{4}{5} = 8.

Adding the three evaluated terms together:
(4π−11)+10+8=4π+7(4\pi - 11) + 10 + 8 = 4\pi + 7.

Answer: 4π+74\pi + 7
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