Question

4cosπ/10-3secπ/10-2tanπ/10

Answer 1

4cos180°/10 - 3sec180°/10 - 2tan180°/10
= 4cos18° - 3sec 18° - 2tan18°
= 4×0.951 - 3×1.514 - 2×0.324
= 3.804 - 4.542 - 0.65
= -1.388......