# Logic is the key to success!

**Calculus**Level 2

Evaluate the expression!

x{[sin[arc tan (2x/√(z^2 - 4x^2))]]2y -2√(z^2 - 4x^2)[sin[arc tan (2x/√(z^2 - 4x^2))]] + [sin[arc cos (2x/z)]]x} - {[sin[arc tan (2x/√(z^2 - 4x^2))]][sin[90 - arc sin (2x/z)]](zx/2) + sin[arc tan (2x/√(z^2 - 4x^2))] - 2x[sin[arc tan (2x/√(z^2 - 4x^2))]]√(z^2 - 4x^2)}