If \( \frac{a}{b} + \frac{b}{a} = 1 \) and a + b = 2, then the value of a3 + b³ is:
The external diameter of an iron pipe is 20 cm and its length is 12 cm. If the thickness of the pipe is 1 cm, find the surface area of the pipe (take π = 22/7) correct to two places of decimal.
What is the value of \( \frac{\cos 37^\circ}{\sin 53^\circ} \)?
What is the value of
\(
\cos\!\left(-\frac{17\pi}{3}\right)
\)