1.

If cos 21° = x/y, then cosec 21° ­ cos 69° is equal to1). $\frac{x^{2}}{y\sqrt{y^{2}-x^{2}}}$2). $\frac{y^{2}}{x\sqrt{y^{2}-x^{2}}}$3). $\frac{y^{2}}{x\sqrt{x^{2}-y^{2}}}$4). $\frac{x^{2}}{y\sqrt{x^{2}-y^{2}}}$

Answer» CORRECT ANSWER is: OPTION 1


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