化简并求T(和向量有关)y=sinx+cos(x+六分之派),化简并求T
1个回答

y=sinx+cos(x+π/6)

=sin[(x+π/6)-π/6]+cos(x+π/6)

=sin(x+π/6)cosπ/6-cos(x+π/6)sinπ/6+cos(x+π/6)

=√3/2sin(x+π/6)-1/2cos(x+π/6)+cos(x+π/6)

=√3/2sin(x+π/6)+1/2cos(x+π/6)

=sin(x+π/6+π/6)

=sin(x+π/3)

∴周期T=π/3.