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Evaluate cos(π2+π3)...

Evaluate cos(π2+π3)

A.

23

B.

32

C.

34

D.

43

Correct answer is B

cos(x+y)=cosxcosysinxsiny

cos(π2+π3)=cosπ2cosπ3sinπ2sinπ3

= (0×12)(1×32)

= 032=32