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Sin43×cos47+cos47×sin43
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Sin43×cos47+cos47×sin43

User Fuseblown
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1 Answer

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sin(α + β) = sin(α)cos(β) + cos(α)sin(β)

sin43×cos47+cos47×sin43 = sin(43 + 47)

= sin(90) = 1
User Gillyspy
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