Can plz you list the formulae of function change while putting ((pie/2) - x ) like
sin(pie/2 - x) = sin x
cos (pie/2 - x) = - sin x
something like that.
Also, explain it using graph (4 quadrant system, All +ve in 1st quad, Sin +ve in 2 quad, T in 3rd, C in 4th quad method)
Means how I use this ASTC for help in these formulae.