Find the maximum amplitude instantly using the harmonic R-formula hack!

Find the maximum amplitude instantly using the harmonic R-formula hack!
Compute vector projection without calculating angles using this standard A-Level formula!
Solve for the parameter k when two 3D vectors are orthogonal using the zero dot product condition.
Solve perpendicular vector exam questions effortlessly using the zero dot product condition.
Master the harmonic R-formula hack to find extreme values of trigonometric rational functions without calculus! #TrigHacks