12−17t+6t22t−3\frac{12-17t+6t^2}{2t-3}2t−312−17t+6t2
cos(θ)−sin(θ)sin(θ)+cos(θ)+sin(θ)cos(θ)\frac{cos\left(\theta\right)-sin\left(\theta\right)}{sin\left(\theta\right)}+\frac{cos\left(\theta\right)+sin\left(\theta\right)}{cos\left(\theta\right)}sin(θ)cos(θ)−sin(θ)+cos(θ)cos(θ)+sin(θ)
2 x+2−122\:x+2-122x+2−12
cscasina−1tan2a=1\frac{\csc a}{\sin a}-\frac{1}{\tan^2a}=1sinacsca−tan2a1=1
3(x2+8x)3\left(x^2+8x\right)3(x2+8x)
−4⋅19-4\cdot19−4⋅19
∫3xsenzxdx\int^{3x}senzxdx∫3xsenzxdx
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