MCQ
${d \over {dx}}\sqrt {{{\sec }^2}x + {\rm{cose}}{{\rm{c}}^2}x} = $
- A$4\ \text{cosec}\ 2x.\cot 2x$
- ✓$ - 4\ \text{cosec}\ 2x.\cot 2x$
- C$ - 4\ \text{cosec}\ x.\cot 2x$
- Dએક પણ નહીં
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