Cos63cos27-sin 12 sin 48

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First, we need to expand cos(63)cos(27) - sin(12)sin(48) using trigonometric identities.

cos(63)cos(27) - sin(12)sin(48) = (cos(63)cos(27) - sin(12)sin(48))

Using the angle addition formula for cosine: cos(a + b) = cos(a)cos(b) - sin(a)sin(b)

We get:

cos(63)cos(27) - sin(12)sin(48) = cos(63-27) = cos(36)

Therefore, the simplified expression is cos(36).