Find the derivative of y = 12x⁴ + (5/x⁷) − 8cscx
A. y′ = 48x³ − (35/x⁸)​ + 8cscxcotx
B. y′ = 48x³ − (35/x⁸) − 8cscxcotx
C. y′ = 48x³ − (5/7x⁶) + 8cscxcotx
D. y′ = 48x³ − 48x³ + 8cscxcotx