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\left. \begin{array} { l } { \text { Q. } 8 . \text { If } 3 \operatorname { cot } A = 4 \text { check whether } } \\ { \frac { 1 - \operatorname { tan } ^ { 2 } A } { 1 + \operatorname { tan } ^ { 2 } A } = \operatorname { cos } ^ { 2 } A - \operatorname { sin } ^ { 2 } A \text { or not. } } \end{array} \right. |
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