Question

Find the value of cos 70÷ sin 20 +cos 57 +Cosec 33 -2 cos 35 ×Cosec 55

Answer 1

$\frac{cos (90-20)}{sin 20} + cos (90-33) *cosec 33-2cos (90-55) * cosec 55\\\\= \frac{sin 20}{sin 20}+ sin 33*\frac{1}{sin 33} -2 sin 55*\frac{1}{sin 55\\}\\\\=1+1+2\\\\=3$