grandes-ecoles 2019 Q27

grandes-ecoles · France · centrale-maths2__pc Trig Proofs Trigonometric Inequality Proof
Show the inequality $t\cos(t) \leqslant \sin(t)$, for every $t$ in $[0, \pi/2]$.
Show the inequality $t\cos(t) \leqslant \sin(t)$, for every $t$ in $[0, \pi/2]$.