Question: 6. Evaluate: tan-1 (tan ) 6. 7. Evaluate: cos-1 (cos (137 ) ) S A x 2 +y 2 arz 7 . 0, 140 3TT

6. Evaluate: tan-1 (tan ") 6. 7. Evaluate: cos-1 (cos (137 ) ) S A x 2 +y 2 arz 7 . 0, 140 3TT 13 T 8 . Evaluate: tan (sin-1 (-1) ) 8 . 9. Evaluate: sin-1 ( cos - ST) 9 . A xtyr z * 2 + 6 2 = 5 TT 2 GIT 'O X C 5 IT

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