Which expression is equal to sin 75°? sin 135° cos 60° – cos 135° sin 60° cos 135° cos 60° + sin 135° sin 60° sin 135° cos 60° + cos 135° sin 60° cos 135° cos 60° – cos 135° cos 60°?

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08-05-2018
Mathematics

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Which expression is equal to sin 75°? sin 135° cos 60° – cos 135° sin 60° cos 135° cos 60° + sin 135° sin 60° sin 135° cos 60° + cos 135° sin 60° cos 135° cos 60° – cos 135° cos 60°?

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sarkhan2018 sarkhan2018 · Answer 1 · 2018-05-17T09:16:47+02:00

sarkhan2018 sarkhan2018

17-05-2018

These are the sum/difference formulas in trigonometry. The first formula is in accordance with sin ( α - β ) = sinα *cosβ - cosα * sinβ. If we combine the first one with this formula, we'll obtain sin 135° cos 60° – cos 135° sin 60° = sin (135-60) = sin75°

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user90876 user90876 · Answer 2 · 2018-12-24T17:05:33+01:00

user90876 user90876

24-12-2018

Answer:

The answer is A

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