MCQ
જો $\theta = {\tan ^{ - 1}}a,\phi = {\tan ^{ - 1}}b$ અને $ab = - 1,$ તો $\theta - \phi = $
- A$0$
- B$\frac{\pi }{4}$
- ✓$\frac{\pi }{2}$
- Dએકપણ નહીં.
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