Question

evaluate: cos30 cos 45–sin 30 sin 45​

Answer 1

Answer:

√3/2√2 - 1/2√2

Step-by-step explanation:

cos30= √3/2

cos45=1/√2

sin30=1/2

sin45=1/√2

cos30 cos 45–sin 30 sin 45​

(√3/2)(1/√2) - (1/2)(1/√2)

√3/2√2 - 1/2√2

Answer 2

Answer:

Step by Step Explanation:

WKT

cos 30° = √3/2

cos 45° = 1/√2

sin 30° = 1/2

sin 45° = 1/√2

cos 30°. cos 45° - sin 30°. sin 45°

=√3/2 . 1/√2 - 1/2 . 1/√2

= √3/2√2 - 1/2√2

= √3 - 1 / 2√2

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