2. Prove that

2 / cos 2x + 1 = sec^2 x.

In δabc, if the length of side b is 3 centimeters and the measures of ∠b and ∠c are 45° and 60°, respectively, what is the length of side c to two decimal places?

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

If x+y+z=0 what is the value of [tex] {x}^{3} + {y}^{3} + {z}^{3} [/tex]