I need some help proving bijections:
Suppose f is a function from R2→R2
Defined by
f(x,y)=(ax−by,bx+ay)
Where a,b are numbers with a2+b2≠0
Prove that f is a bijection.
I understand that a function f is a bijection if it is both an injection and a surjection so I would need to prove both of those properties.
Could you give me a hint on how to start proving injection and surjection?
Thanks.
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