The sum of three sides of an isosceles triangle is 20 cm, and the ratio of an equal side to the base is 3 : 4. The altitude of the triangle is:
\(3\sqrt{3}\,\text{cm}\)
\(3\sqrt{5}\,\text{cm}\)
\(4\sqrt{5}\,\text{cm}\)
\(2\sqrt{5}\,\text{cm}\)
The value of \(441 \div \left[270 \div \tfrac{3}{7} \text{ of } 35 + \left(17 \div \tfrac{1}{3}\right) - \left(8\tfrac{1}{2} - \tfrac{5}{2}\right)\right]\)
If cot2 θ + cot4 θ = 2, then the value of 2 sin4 θ + sin2 θ is: