An inclined plane making an angle of \( 22^{\circ} \) with the horizontal has a pulley at its top. A \( 31-\mathrm{kg} \) block on the plane is connected to a freely hanging \( 21-\mathrm{kg} \) block by means of a cord passing over the pulley. Calculate the acceleration for the \( 21-\mathrm{kg} \) block. Take the friction coefficient between the block A and the plane to be 0.20 .

Express \( \frac{2 x+1}{(x+1)\left(x^{2}-1\right)} \) in partial fraction

5. A complex function can be modelled by the equation: \[ y=\cos \left(x^{3}\right) 3 x^{2} \] Find the indefinite integral of the function \( \left(\int \cos \left(x^{3}\right) 3 x^{2} d x\right) \) using a substitution method.

\( \left\{\begin{array}{l}\text { A riv has pdf. } \\ k ; 1

(7) TAREFA 7 Subtraçöes Descobre o resultado das seguintes subtraçōes. Explica o teu raciocinio. \( \begin{array}{ll}\text { 1. } 3-5 & \text { 3. }-5-(-3) \\ \text { 2. }-3-5 & \text { 4. }-3-(-5)\end{array} \)

в параллелограмме \( A B C D \) на стороне \( C D \) отложена точка \( M \), причём \( C M: M D \) \( =6: 7 \) вырази векторы \( \overrightarrow{B M} \) и \( \overrightarrow{M A} \) через векторы \( \vec{a}=\overrightarrow{B A} \) и \( \vec{b}=\overrightarrow{B C} \) \( \overrightarrow{B M}=\frac{\square}{a}+\vec{b} \) \( \overrightarrow{M A}=\vec{a}-\vec{b} \)