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| 1. |
SecA+tanA=x then prove sinA =x sqare -1divided by x sqare+1 |
| Answer» SecA+tanA=X; secA-tanA=1/x adding we get 2secA=x+1/x>>>>secA=x square+1 divide 2x that is cosA=2x/x square+1 i.e sinA=√1-cosA^ | |