The solutions are given in each case, so you can try them quickly. Solutions can be copied with copy and paste. Copy and paste may not work on a smartphone.
Algebra
Let s be positive.
Solution:
2hr
Integral calculus
Solution:
2
Trigonometry
Solution:
\cos \left(x\right)\times \sin \left(y\right)
or\cos x\times \sin y
Solution:
\cos \alpha
or\cos \left(\alpha\right)
Solution:
-\sin x
Physics
What is the kinetic energy Ekin of a body of mass
m=60\unit{kg}
and speedv = 72\unit{\frac{km}{h}}
?Solution:
12\unit{kJ} = 12\unit{kNm} = 12000\unit{J} = 12000\unit{\frac{kg\times m^2}{s^2}}=0.012\unit{MJ}