Inverse trigo

VITEEE Discussion Forum › Trignometry questions › Inverse trigo

tan^-1(tan 7) =

a:7-2Î
b:2Î -7
c:7

Please give the reason behind the answer.

#Mathematics #Trignometry #Inverse trigonometric functions

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1 Answers

1357

Manish Shankar ·2014-06-04 03:44:15

tan^-17=-tan^-1(2Ï€-7)=7-2Ï€

or in other way.

7 lies in I quadrant and so tan 7 is positive. Also we have to bring the angle in between -Ï€/2 and Ï€/2

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Raunaq Saha okay so that means sin^(-1)[sin 5] = 2pi-5 but in the book its written 5-2pi which one is correct ?
Upvote·0· Reply ·2014-06-04 05:29:25
Himanshu Giria 5-2pi is right coz 5 is in 4th quad. were sin-1 is -ve ...
Upvote·0· Reply ·2014-06-04 08:54:56
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