# Example 1 2 Exemplar Problems Chapter 3 Class 11

“The distance between insanity and genius is measured only by success.” —Bruce Feirstein

# Example 1 & Example 2 Chapter 3 Trigonometric Functions

Example 1 A circular wire of radius 3 cm is cut and bent so as to lie along the circumference of a hoop whose radius is 48 cm. Find the angle in degrees which is subtended at the center of hoop.

Example 2 If $A=\cos^2\theta+\sin^4\theta$, for all values of $\theta$, then prove that $\frac{3}{4}\le A\le 1$.