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If `0ltthetalt 90^(@)+sintheta=m and tan_(theta)-sin_(theta)=n`where m=b then the value of `m^(2)-n^(2)` isA. `2(tan^(2)theta+sin^(2)theta)`B. 4mmC. `4sqrtmm`D. `2(m^(2)+n^(2))` |
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Answer» Correct Answer - c `tan theta+sintheta= m` squaring both sides `tan^(2)theta+sin^(2)theta+2 tan thetasintheta=m^(2)` `tan theta-sin theta=n` squaring both sides `tan^(2)theta+sin^(2)theta-2tan theta sin theta=n^(2)` Subtract from (i) `&` (ii) `m^(2)-n^(2)=tan^(2)theta+sin^(2)+2tan theta` `sin theta-tan^(2)theta-sin^(2)theta+2tan theta` `sin theta` `m^(2)-n^(2)=4tan theta sin theta` ` 4sqrt(tan^(2)thetasin^(2)theta)` `=4sqrt(tan^(2)theta(1-cos^(1)theta))` `=4sqrt(tan^(2)theta-sin^(2)theta)` `=4sqrt(mm)` |
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