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LTP1 MAT233

Total questions: 7

Worksheet time: 4mins

Name
Class
Date
1.

Given the function  f(x)=ln(32x)+3f\left(x\right)=\ln\left(3-2x\right)+3  
a) Find  f1(x)f^{-1}\left(x\right) .

a)

 f1(x)=3+ex32f^{-1}\left(x\right)=\frac{3+e^{x-3}}{2}  

b)

 f1(x)=3ex+32f^{-1}\left(x\right)=\frac{3-e^{x+3}}{2}  

c)

 f1(x)=3ex32f^{-1}\left(x\right)=\frac{3-e^{x-3}}{2}  

d)

 f1(x)=3+ex+32f^{-1}\left(x\right)=\frac{3+e^{x+3}}{2}  

2.

Given the function f(x)=ln(32x)+3f\left(x\right)=\ln\left(3-2x\right)+3 .
a) Sketch the graph of  f1(x)f^{-1}\left(x\right)  .

a)
b)
c)
d)
3.

Given the function f(x)=ln(32x)+3f\left(x\right)=\ln\left(3-2x\right)+3  
b) Determine the domain and range of  f(x)f\left(x\right)  and  f1(x)f^{-1}\left(x\right)  .

a)

 Df=Rf1=(,32), Rf=Df1=(,)D_f=R_{f^{-1}}=\left(-\infty,\frac{3}{2}\right),\ R_f=D_{f^{-1}}^{ }=\left(-\infty,\infty\right)  

b)

 Df=Rf1=(,), Rf=Df1=(,32)D_f=R_{f^{-1}}=\left(-\infty,\infty\right),\ R_f=D_{f^{-1}}=\left(-\infty,\frac{3}{2}\right)  

c)

 Df=Rf1=(,3), Rf=Df1=(,)D_f=R_{f^{-1}}=\left(-\infty,3\right),\ R_f=D_{f^{-1}}=\left(-\infty,\infty\right)  

d)

 Df=Rf1=(,), Rf=Df1=(,3)D_f=R_{f^{-1}}=\left(-\infty,\infty\right),\ R_f=D_{f^{-1}}=\left(-\infty,3\right)  

4.

Use triangle method to simplify  cos(2tan143+π)\cos\left(2\tan^{-1}\frac{4}{3}+\pi\right) .

a)

 257\frac{25}{7}  

b)

 725\frac{7}{25}  

c)

 2425\frac{24}{25}  

d)

 2524\frac{25}{24}  

5.

Use logarithmic differentiation to find the derivative of
 y=(lnx)sinh xy=\left(\ln x\right)^{\sinh\ x} .

a)

 dydx=(lnx)sinhx[sinhxlnx+coshxlnx]\frac{dy}{dx}=\left(\ln x\right)^{\sinh x}\left[\frac{\sinh x}{\ln x}+\cosh x\ln x\right]  

b)

 dydx=y[sinhxlnx+coshxln(lnx)]\frac{dy}{dx}=y\left[\frac{\sinh x}{\ln x}+\cosh x\ln\left(\ln x\right)\right]  

c)

 dydx=(lnx)sinhx[sinhxxlnx]+coshxln(lnx)\frac{dy}{dx}=\left(\ln x\right)^{\sinh x}\left[\frac{\sinh x}{x\ln x}\right]+\cosh x\ln\left(\ln x\right)  

d)

 dydx=(lnx)sinhx[sinhxxlnx+coshxln(lnx)]\frac{dy}{dx}=\left(\ln x\right)^{\sinh x}\left[\frac{\sinh x}{x\ln x}+\cosh x\ln\left(\ln x\right)\right]  

6.

Use a suitable substitution to evaluate  32x2+8x+16dx\int\frac{3}{2x^2+8x+16}dx .

a)

 32sin1(x+22)+C\frac{3}{2}\sin^{-1}\left(\frac{x+2}{2}\right)+C  

b)

 34tan1(x+22)+C\frac{3}{4}\tan^{-1}\left(\frac{x+2}{2}\right)+C  

c)

 34tanh1(x+22)+C\frac{3}{4}\tanh^{-1}\left(\frac{x+2}{2}\right)+C  

d)

 34coth1(x+22)+C\frac{3}{4}\coth^{-1}\left(\frac{x+2}{2}\right)+C  

7.

Use a suitable substitution to evaluate  0π2cosx1+sin2xdx\int_0^{\frac{\pi}{2}}\frac{\cos x}{1+\sin^2x}dx  .

a)

 π2=1.5708 rad or 90°\frac{\pi}{2}=1.5708\ rad\ or\ 90\degree  

b)

 π3=1.0472 rad or 60°\frac{\pi}{3}=1.0472\ rad\ or\ 60\degree  

c)

 π6=0.5236 rad or 30°\frac{\pi}{6}=0.5236\ rad\ or\ 30\degree  

d)

 π4=0.7854 rad or 45°\frac{\pi}{4}=0.7854\ rad\ or\ 45\degree