Question

Express cot85+cos75 in terms of trigonometric ratios of angles between 0 and 45

Answer 1

cot85+cos75 = cot(90-5)+ cos(90-15)
= tan 5+sin 15

Answer 2

$\\ \\ \bf cot~ 85°+ cot ~75° </p><p>\\ \\ \bf = cot~ (90° - 5°) + cos ~(90°-15°)</p><p>\\ \\ \bf = tan ~5° + sin ~15°$