tolong dijawab soal integral ini

[tex] \int\limits {sin^{2}x-cos^{2}x } \, dx [/tex]
[tex] \int\limits {2sin^{2}x-1 } \, dx [/tex]
[tex] \int\limits {-cos2x } \, dx [/tex]
[tex]=- \frac{1}{2}sin2x [/tex]