tan³ (x) = 3 tan(x)
tan³ (x) = tan (x)
2 sin² w+3 sin w+1=0
2 cos²t+cost=1
2 cos² (0)=2+ sin(0)
20. cos' (t) = cos(1)
22. tan' (x)-9 tan(x) = 0
24. 2 cos²x+3 cos(x)+1=0
26. 2 sin² (0) + 3 cos (0)-3=0
28. 4 sin(x) cos(x) +2sin(x)-2cos(x)-1=0
2 sin(x) cos(x)=sin(x)+2 cos(x)-1=0
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