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Evaluate Cos 45o Cos 30o - Sin 45...

Evaluate Cos 45o Cos 30o - Sin 45o Sin 30o leaving the answer in surd form

A.

212

B.

324

C.

622

D.

624

Correct answer is D

cos45o×cos30osin45o×sin30o12×3212×12322122;=3122=624