The value of in degrees is equal to

MATHEMATICS · Single correct · CBSE · Mathematics · Inverse Trigonometric Functions · Inverse Trigonometric Functions

Problem

The value of tan⁡−1(tan⁡65∘−2tan⁡40∘)\tan^{-1}(\tan65^\circ-2\tan40^\circ) in degrees is equal to (1) −20∘-20^\circ (2) 20∘20^\circ (3) 25∘25^\circ (4) 40∘40^\circ

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