Question

1-2sinA.cosA≥0 proove it​

Answer 1

Answer:

$1 - 2 \sin(a) \cos(a) \\ = 1 - \sin(2a) \\ (now \: \: \ 0 \leqslant sin(2a) \leqslant 1 )\\ \\ = 0 \geqslant - \sin(2a) \geqslant 1 \\ = 1 \geqslant 1 - \sin(2a) \geqslant 0$