Question

Tan20 cot70-sec20 cosec70

Answer 1

$\tan(90 - 70) \times \cot(70 -) - \sec(90 - 20) \times \csc(70) \\ \\ \ \cot(70 ) \times \cot(70) - \ \ \csc(70) \times \csc(70) \\ \\ 2 \cot(70) - 2 \csc(70)$