MBA Exam

If sin x + sin2 x = 1, then find the value of (cos12x + 3 cos10 x + 3 cos8 x + cos6 x – 1)?

1) -1
2) 2
3) 0
4) 1

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MBA Other Question
How many terms in the expansion of are integers?with explanation too

1) 201
2) 126
3) 25
4) 26
 52.11- For how many natural numbers n, n^2 + n + 1 is divisible by 15?

1) 0
2) 1
3) 2
4) Infinite