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CUET
General Test
Quantitative Reasoning
Trigonometry
If secx = 7x and tanx =7x find the value of 98(x2-1x2)+2. |
7 4 0 6 |
4 |
We know that sec2x - tan2x = 1 (7x)2 - (7x)2=1 49x2 -49x2 = 1 49(x2-1x2) = 1 x2-1x2=149 ⇒ Put in find ⇒ 98(149)+2 = 4 |