I need to fine the exact value of these problems. Thank you! 1) cos(2 cos^-1 4/5) 2) cos [2 tan^-1 (-4/3)]
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Originally Posted by onoitsvi I need to fine the exact value of these problems. Thank you! 1) cos(2 cos^-1 4/5) 2) cos [2 tan^-1 (-4/3)] 1) cos(2 cos^-1 4/5) substitute value of cos x from (1) and solve 2) cos [2 tan^-1 (-4/3)] substitute value of tan x from (2) and solve
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