Trigonometrical Equations
normal

સમીકરણ $\sin 2\theta  + \cos 2\theta  =  - \frac{1}{2},\theta \in \left( {0,\frac{\pi }{2}} \right)$  ના ઉકેલોની સંખ્યા મેળવો, 

A

$0$

B

$1$

C

$2$

D

$3$

Solution

${\sin 2 \theta+\cos 2 \theta=-\frac{1}{2}} $

${\sin \left(\frac{\pi}{4}+2 \theta\right)=-\frac{1}{2 \sqrt{2}}} $

${\text { Let } \frac{\pi}{4}+2 \theta=\alpha} $

${\sin \alpha=-\frac{1}{2 \sqrt{2}}} $

${\therefore \text { only one solution }}$

Standard 11
Mathematics

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