2.25+2.25-2(1.5x1.5) x (cos 1.5)
Rewrite it to take out the "x" multiplication signs. Also I'm assuming it's 1.5 degrees.
2.25+2.25-(2)(1.5)(1.5)(cos 1.5°)
= 4.5 - 4.5(cos 1.5°)
≈ 4.5 - 4.5(0.9996573)
≈ 0.001542
