The answer for this question is c.
0.0006403415 is the answer to this question.
Because there is no number that when multiplied by itself that could equal to 10 (ex: 16 is a perfect square because 4 and 4 multiplied together equals 16; 4 and 4 are the same number)
Sec x and cot x are the reciprocals of cos x and tan x respectively.
So, for example, cos x = adj / hyp, so sec x = hyp / adj
The last choice is the correct one because tan x = opp / adj so cot = adj / opp.
