यदि $\sin \alpha = \frac{1}{2}$ और $\cos \beta = \frac{1}{2}$ है,तो $(\alpha + \beta)$ का मान क्या होगा ($^{\circ}$ में)?
- A$0$
- B$90$
- C$30$
- D$60$
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व्यंजक $(\cos^{2} 23^{\circ} - \sin^{2} 67^{\circ})$ का मान धनात्मक है।
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