Question

medal and fan. are these right???

Answer 1

hint: we have the subsequent inequlities:
\[ - 1 \leqslant \sin x \leqslant 1,\quad - 1 \leqslant \cos x \leqslant 1\]

Answer 2

from the first inequality, I get:
\[ - 1 \leqslant \sin \left( {x - \pi } \right) \leqslant 1\]
so, if Imultiply all sides by \(3\), I get:
\[ - 3 \leqslant 3\sin \left( {x - \pi } \right) \leqslant 3\]

Answer 3

I think that all your answers are correct!