sinx+cosx=根号2sin(?)
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sinx+cosx=根号2sin(?)
sinx+cosx=根号2sin(?)
sinx+cosx=根号2sin(?)
sinx+cosx
= √2(sinx× √2/2+cosx× √2/2)
=√2(sinx×cosπ/4+cosx×sinπ/4)
=√2sin(x+π/4)
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