Question

If $u=\sqrt{a^{2}\cos^{2}\theta+b^{2}\sin^{2}\theta}+\sqrt{a^{2}\sin^{2}\theta+b^{2}\cos^{2}\theta}$ then the difference between the maximum and minimum values of u² is given by
(a) (a - b)²
(b) $2\sqrt{a^{2}+b^{2}}$
(c) (a + b)²
(d) 2(a² + b²)

Answer 1

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