1.

The value of 152 (sin 30 + 2 cos 45 + 3 sin 30 + 4 cos 45 + .... + 17 sin 30 + 18 cos 45 ) is

A. an integer but not a perfect square
B. a rational number but not an integer
C. a perfect square of an integer
D. irrational
Answer» D. irrational


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