Sorry about all my threads, but hope you guys can help me once again.
Just a simple question.
f(x) = a + bcos2x
f(0) = a + bcos2(0) = -1
Now this is where I'm slightly confused. "Anything multiplied by 0 is 0", right, and because b is multiplied to cos2(0), then surely that removes b and you get:
f(0) = a + b(0)
f(0) = a = -1
But, according to the textbook, it's not. They say its:
f(0) = a + b = -1