If cos53° = x/y, then sec 53° + cot 37° is equal to:
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Correct answer: C
Explanation
The correct answer is option 3 i.e. 
cos 530 = x/y
sec 530 = y/x
tan(90 - 53) = cot 370 = 1/(tan 370) = √(y2 - x2)/x
Putting the value of sec 530 and cot 370 -
sec 530 + cot 370 = (y/x) + √(y2 - x2)/x = [y + √(y2 - x2)]/x