MCQ
જો $f(x) = {\cos ^2}x + {\sec ^2}x,$ તો
- A$f(x) < 1$
- B$f(x) = 1$
- C$1 < f(x) < 2$
- ✓$f(x) \ge 2$
we have ${x^2} + \frac{1}{{{x^2}}} \ge 2$ and
Hence, $f(x) = {\cos ^2}x + \frac{1}{{{{\cos }^2}x}} \ge 2$.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$A_k=a_1^2-a_2^2+a_3^2-a_4^2+\ldots+a_{2 k-1}^2-a_{2 k}^2$ .
જો $\mathrm{A}_3=-153, \mathrm{~A}_5=-435$ અને $\mathrm{a}_1^2+\mathrm{a}_2^2+\mathrm{a}_3^2=66$ હોય, તો $\mathrm{a}_{17}-\mathrm{A}_7=$............