**Question:**

Let $S$ be the set of all $\alpha \in \mathrm{R}$ such that the equation, $\cos 2 x$ $+\alpha \sin x=2 \alpha-7$ has a solution. Then $\mathrm{S}$ is equal to :

Correct Option: 4

JEE Main Previous Year April 12, 2019 (II)

**Solution:**

Let $S$ be the set of all $\alpha \in \mathrm{R}$ such that the equation, $\cos 2 x$ $+\alpha \sin x=2 \alpha-7$ has a solution. Then $\mathrm{S}$ is equal to :

Correct Option: 4

JEE Main Previous Year April 12, 2019 (II)
**Solution:**