Others Maths Puzzle Numerical Ability Trigonometry

cos 30d/sin 10d + cos 59d/sin 31d =?

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Others Other Question

jan =7110
feb =826
march = 5313
april=541
may=3513



september = ?
how can we find out sum of digits like 6^2015 or like 7^1686 and in the same way any general solution for these type of questions