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What is sin4\5×cos3\5+cos4/5sin3\5​

User Tomato
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\sin( (4)/(5) ) \cos( (3)/(5) ) + \cos( (4)/(5) ) \sin( (3)/(5) ) \\ = \sin( (4)/(5) + (3)/(5) ) = \sin( (7)/(5) )

User Chris Fregly
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