Mathematics

Mathematics

Problem

The value of the angle tan⁡−1(tan⁡65∘−2tan⁡40∘)\tan^{-1}(\tan 65^\circ - 2 \tan 40^\circ) in degrees is equal to a. −20∘-20^\circ b. 20∘20^\circ c. 25∘25^\circ d. 40∘40^\circ

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