MCQ
Find mirror image of point representing x + i y on imaginary axis:
- A(x, y)
- B(-x, -y)
- C(-x, y)
- D(x, -y)
Solution:
Mirror image of point (x, y) on imaginary axis is (-x, y).
Since imaginary axis is acting as mirror y-coordinate remains same whereas x - coordinate gets inverted.So, (-x, y) is mirror image of (x, y) on imaginary axis.
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If (a, b) lies on circle with centre as origin, then its radius will be:
$\lim\limits_{\text{x} \rightarrow0}\frac{\text{cosec}-\cot\text{x}}{\text{x}}$ is equal to:
$-\frac{1}{2}$
$1$
$\frac{1}{2}$
$-1$