y=sinx+cosx可化成_____?A.2sin(x-π/4);B.2sin(x+π/4); C.√2sin(x-π/4);D.√2sin(x+π/4);
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y=sinx+cosx可化成_____?A.2sin(x-π/4);B.2sin(x+π/4); C.√2sin(x-π/4);D.√2sin(x+π/4);
y=sinx+cosx可化成_____?A.2sin(x-π/4);B.2sin(x+π/4); C.√2sin(x-π/4);D.√2sin(x+π/4);
y=sinx+cosx可化成_____?A.2sin(x-π/4);B.2sin(x+π/4); C.√2sin(x-π/4);D.√2sin(x+π/4);
y=sinx+cosx
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=√2*[sinx*cos(π/4) +cosx*sin(π/4)]
=√2*sin(x +π/4)
y=sinx怎样变化成y=sinx+cosx
y=sinx+cosx可化成_____?A.2sin(x-π/4);B.2sin(x+π/4); C.√2sin(x-π/4);D.√2sin(x+π/4);
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