13
∫sin(1-t)dt=-cos(1-t)*(-1)=cos(1-t)+C
14
∫cos(1/2φ+2)dφ=sin(1/2φ+2)*2=2sin(1/2φ+2)+C
15
∫(cos(x/3)-sin3x)dx=sin(x/3) *3+cos3x *1/3=3sin(x/3)+1/3*cos3x+C
16
∫dx/cos²2x=tg2x*1/2=1/2*tg2x+C
17
∫dx/sin²3x=-ctg3x *1/3=-1/3*ctg3x+C
18
∫dx/(1-2x)=ln|1-2x|*(-1/2)=-1/2*ln|1-2x|+C
19
∫e^2φ dφ=1/2*e^2φ+C
20
∫e^(-3θ)dθ=-1/3*e^(-3θ)+C