I got stuck on solving the following equation. I try all the identities, but hopeless. Do you have any suggestion?
$$(3x + \sin x) \cos x = -3, \quad\pi/2 \leq x \leq \pi$$ Solve for $x$.
Please don't tell me to use the calculator!
I got stuck on solving the following equation. I try all the identities, but hopeless. Do you have any suggestion?
$$(3x + \sin x) \cos x = -3, \quad\pi/2 \leq x \leq \pi$$ Solve for $x$.
Please don't tell me to use the calculator!