Convert angle from degrees to radians
Angle in radians
$$ \alpha_{rad} = {\alpha_{deg} \cdot {\pi \over 180}} $$
Horizontal reaction force in beam support due to point load when fixed support is horizontal, but sliding support is at an angle
Horizontal reaction
$$ B_{h_P} = {{\left({ P \cdot b \cdot \tan\left({ \alpha_{rad} }\right) }\right) \over \left({ a + b }\right)}} $$