MCQ
Which of the following is an open interval?
- A[ ]
- B( )
- C$][$
- ✓B and C
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Then $\sum_{\theta \in S } \sin ^2\left(\theta+\frac{\pi}{4}\right)$ is equal to
$(A)$ the equation of the hyperbola is $\frac{x^2}{3}-\frac{y^2}{2}=1$
$(B)$ a focus of the hyperbola is $(2,0)$
$(C)$ the eccentricity of the hyperbola is $\sqrt{\frac{5}{3}}$
$(D)$ the equation of the hyperbola is $x^2-3 y^2=3$