Question

cos 15π fine the value​

Answer 1

HEY MATE

ur answer

cot 15π

it can also be said as cot (2700)

THUS

cot  15π = 0

hope it helps

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Answer 2

find value of cos(15π)

==) cos (15×180)

==) cos (2700)

Substract 2520 (which is multiple of 360) from 2700

==) You will get cos (180) which is equal to -1

Hence cos(15π) is -1