Evaluate Cos 48 degree - Sin 42 degree.

Answer: 0

To find Cos 48o – Sin 42o

We know that Cos (90 – θ) = Sin θ……..(1)

So we can write Cos 48o as

Cos 48o = Cos (90 – 42)

Cos 48o = Cos (90 – 42) = Sin 42o………(2)

Cos 48o – Sin 42o

From equation (2) we can write the above equation as

Sin 42o – Sin 42o

= 0

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