1-cos2x+sin2x=

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1-cos2x+sin2x=1-cos2x+sin2x=1-cos2x+sin2x=原式=sin2x-cos2x+1=√2(√2/2*sin2x-√2/2cos2x)+1=√2(sin2xcosπ/4

1-cos2x+sin2x=
1-cos2x+sin2x=

1-cos2x+sin2x=
原式=sin2x-cos2x+1
=√2(√2/2*sin2x-√2/2cos2x)+1
=√2(sin2xcosπ/4-cos2xsinπ/4)+1
=√2sin(2x-π/4) +1

1+根号2sin(2x-π/4)

原式=√2(√2/2sin2x +√2/2cos2x)+1=√2sin(2x-π/4)+1