Please check http://teachoo.com/3083/1177/Misc-2---Find-tan-1-(tan-7pi-6)---Chapter-2-Inverse-CBSE/category/Finding-pricipal-value/
To see all answers of Chapter 2 Class 12 Inverse Trigometry, please visit http://teachoo.com/subjects/cbse-maths/class-12th/ch2-12th-inverse-trigonometric-functions/serial-order-wise/
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