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Trigonometry/Trigonometric Equations

Questions (1)

If sina+7sinb=4 (sinc+2sind) and cosa+7cosb=4 (cosc+2cosd), how do I prove that 2cos(a-d) =7cos(b-c)?
1. 1 answer
2. asked by Alexa
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Subcategories (1)

Proving Trigonometric Equations

Parent Categories (1)

Mathematics

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