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Recent questions tagged trignometry

1 votes
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1
ISI2019-MMA-9
$(\cos 100^\circ + i \sin 100^\circ)(\cos 0^\circ + i \sin 110^\circ)$ is equal to $\frac{1}{2}(\sqrt3 – i)$ $\frac{1}{2}(-\sqrt3 – i)$ $\frac{1}{2}(-\sqrt3 +i)$ $\frac{1}{2}(\sqrt3 + i)$
$(\cos 100^\circ + i \sin 100^\circ)(\cos 0^\circ + i \sin 110^\circ)$ is equal to$\frac{1}{2}(\sqrt3 – i)$$\frac{1}{2}(-\sqrt3 – i)$$\frac{1}{2}(-\sqrt3 +i)$$\frac{...
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1 votes
1 answer
2
ISI2019-MMA-8
For $0 \leq x < 2 \pi$, the number of solutions of the equation $\sin^2x + 2 \cos^2x + 3\sin x \cos x = 0$ is $1$ $2$ $3$ $4$
For $0 \leq x < 2 \pi$, the number of solutions of the equation$$\sin^2x + 2 \cos^2x + 3\sin x \cos x = 0$$is$1$$2$$3$$4$
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1 votes
1 answer
3
ISI2019-MMA-7
The value of $\frac{1}{2\sin10^\circ}$ – $2\sin70^\circ$ is $-1/2$ $-1$ $1/2$ $1$
The value of $\frac{1}{2\sin10^\circ}$ – $2\sin70^\circ$ is $-1/2$ $-1$$1/2$$1$
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