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Statement-1: `cosec^(-1)(3)/(2)+cos^(-1)(2/3)-2cot^(-1)(1/7)-cot^(-1)7=cot^(-1)7` Statement-2: `cos^(-1)x=sin^(-1)((1)/(x)) and for xgt0cot^(-1)x=tan^(-1)((1)/(x))`A. Statement-1 is is True, Statement-2 is true, Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
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Answer» statement -2 is true (see theory) using statement -2 we have `cosec^(-1)3/2+cos^(-1)2/3-2cos^(-1)1/7-cos^(-1)7` `=(sin^(-1)2/3+cos^(-1)2/3)-cot^(-1)1/7-(tan^(-1)7+cot^(-1)7)` `=(pi)/(2)-cot^(-1)1/7-(pi)/(2)=-cot^(-1)1/7=-tan^(-1)7` so statement -1 is not correct |
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