I need to prove that: 1+cos(a+b)−cos(a−b)=cos2(a)+cos2(b)
I tried to start from both ways but it always took me back to the same one again I tried also to prove that their - equal zero but I didn't work also
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...
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