Question

cos 45º cos 60° - sin 45° sin 60°
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Answer 1

Answer:

(√2-√6)/4

Step-by-step explanation:

cos 45° cos 60° - sin 45° sin60°

=1/√2×1/2 - 1/√2-√3/2

=√2/4 - √3/4

=(√2-√3)/4

Answer 2

cos45°cos60°-sin45°sin60°

=1/√2×1/2-1/√2×√3/2

=1/2√2-√3/2√2

=(1-√3)/2√2

on rationalizing we get

(2√2-2√6)/8 ans.

I have solved it .