Question

Evaluate 7 cot2 0 - 7 cosec2 O a) -1. b) -7. c) 1 d) none of these​

Answer 1

5cot230o+7cosec245o=5⋅(3)2+7(2)2   [∵cot30o=3,cosec45o=2]

=5⋅3+7⋅2

=15+14

=29.