1.

If $${\text{cos}}\theta= \frac{{{x^2} - {y^2}}}{{{x^2} + {y^2}}}$$then the value of$${\text{cot}}\theta $$is equal to $$\left[ {{\text{if }}{0^ \circ } \leqslant \theta\leqslant {{90}^ \circ }} \right]$$

A. $\frac{{2xy}}{{{x^2} - {y^2}}}$$
B. $\frac{{2xy}}{{{x^2} + {y^2}}}$$
C. $\frac{{{x^2} + {y^2}}}{{2xy}}$$
D. $\frac{{{x^2} - {y^2}}}{{2xy}}$$
Answer» E.


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