Verified Answer :

LammettHash

\(\cos x+2\cos x\sin x=\cos x(1+2\sin x)=0\)

\(\cos x=0\) in the given interval when \(x=\dfrac\pi2,\dfrac{3\pi}2\).

\(1+2\sin x=0\implies \sin x=-\dfrac12\) when \(x=\dfrac{7\pi}6,\dfrac{11\pi}6\).

Answer: -(sqrt 3/2)

Step-by-step explanation:

Related Questions