2sinxn−1∑r=1sinrxcos[(n−r)y]≡cos(nx)−cos(ny)cosx−cosy−sin(nx)sinx
The identity can be tediously proven using the Axiom of Induction.
I am looking for other means of proving this identity.
I have injection f:A→B and I want to get bijection. Can I just resting codomain to f(A)? I know that every function i...
No comments:
Post a Comment