What is the value of 3sin230° + 3/5 cos260° - 2sec245°?

Answer: Option A

$$\begin{array}{rl}& 3{\sin }^{2}30^{\circ }+\frac{3}{5}{\cos }^{2}60^{\circ }-2{\sec }^{2}45^{\circ }\\ & =3\times \frac{1}{4}+\frac{3}{5}\times \frac{1}{4}-2\times 2\\ & =\frac{3}{4}+\frac{1}{5}\times \frac{3}{4}-4\\ & =\frac{3}{4}+\frac{3}{20}-4\\ & =\frac{15+3-80}{20}\\ & =\frac{-62}{10}\\ & =\frac{-31}{10}\end{array}$$