1. sin(pi/2)+sin(3pi/2)
2. sin(-pi/2)+cos(pi/2)
3. sin(pi)- cos(pi)
4. sin(0°)-cos(2pi)
5. sin(pi)+sin(1.5pi)
6. sin(0°)+cos(2pi)
7. sin(3pi)-cos(3pi/2)
8. cos(0°)-cos(3pi)+cos(3.5pi)
9. sin(piK)+cos(2piK), K€Z
10. cos/((2K+1)pi)/2- sin((4K+1)pi)/2, K€Z
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