Sum and difference formulae
Trigonometric ratios and identities · Mathematics
Study notes
Q: Find sin 75° using 45° + 30°. sin 75° = sin45°cos30° + cos45°sin30° = (√2/2)(√3/2) + (√2/2)(1/2) = √6/4 + √2/4 = (√6+√2)/4.
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Trigonometric ratios and identities · Mathematics
Q: Find sin 75° using 45° + 30°. sin 75° = sin45°cos30° + cos45°sin30° = (√2/2)(√3/2) + (√2/2)(1/2) = √6/4 + √2/4 = (√6+√2)/4.