化简√(1+sinx)-1
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∵1+sinx
=sin²(x/2)+cos²(x/2)+2sin(x/2) cos(x/2)
=(sin(x/2)+cos(x/2))²,
∴√(1+sinx)-1
=丨sin(x/2)+cos(x/2)丨-1
=√2丨(2/√2)sin(x/2)+(2/√2)cos(x/2)丨-1
=√2丨cos(π/4)sin(x/2)+sin(π/4)cos(x/2)丨-1
=√2丨sin(x/2+π/4)丨-1
=sin²(x/2)+cos²(x/2)+2sin(x/2) cos(x/2)
=(sin(x/2)+cos(x/2))²,
∴√(1+sinx)-1
=丨sin(x/2)+cos(x/2)丨-1
=√2丨(2/√2)sin(x/2)+(2/√2)cos(x/2)丨-1
=√2丨cos(π/4)sin(x/2)+sin(π/4)cos(x/2)丨-1
=√2丨sin(x/2+π/4)丨-1
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