diff cal formula

• arcsin x = 1/√(1 - x^2) 
• arccos x= -1/√(1 - x^2) 
• arctan x = 1/(1 + x^2)
• arccot x = -1/(1 + x^2)
• arcsec x = 1/|x|√(x^2 - 1) 
• arccsc x = -1/|x|√(x^2-1)