sin2x+cos2x
=根号2(根号2/2sin2x+根号2/2*cos2x)
=根号2(cospai/4sin2x+sinpai/4cos2x)
=根号2sin(2x+pai/4)
公式:
cosasinb+sinacosb
=sin(a+b)
不懂问我
y=sin2x+cos2x=√2*sin(2x+45°)
1个回答
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