Question

the value of cos 30° cos 45° - sin 45° = ?

Answer 1

Solution -

cos 30° cos 45° - sin 45° = √3/2 ×1/√2 -1/√2
                                        = √3/2√2 -1/√2
                                        = √6 - 2√2 ÷4

Answer 2

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