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A = 4 , \text { check whether } \frac { 1 - \operatorname { tan } ^ { 2 } A } { 1 + \operatorname { tan } ^ { 2 } A } = \operatorname { cos } ^ { 2 } A |
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Answer» cotA=4/3so tanA=3/4 so cosA=4/5 sinA=3/5L.H.S.=(1-9/16)/(1+9/16)=7/25R.H.S.=16/24-9/25=7/25=L.H.S.Hence Proved. |
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