What is $sin [2 {tan}^{- 1} (- 2)]$ $sin [2 Tan^-1 (-2)]$ ?

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What is $sin [2 {tan}^{- 1} (- 2)]$ $sin [2 Tan^-1 (-2)]$ ?

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Answer 1 · 2018-03-07T06:27:51

-0.8

Explanation:

tan x = - 2
Calculator gives -->
arc $x = - 63^{\circ} 4349$ $x = - 63^@4349$
$2 x = - 126^{\circ} 87$ $2x = -126^@87$
$sin 2 x = sin (- 126.87) = - 0.8$ $sin 2x = sin (- 126.87) = - 0.8$

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What is $sin [2 {tan}^{- 1} (- 2)]$ $sin [2 Tan^-1 (-2)]$ ?

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