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x = y - 1
inversnya = x - 1
2) y = x³
x = ∛y
inversnya = ∛x
3) y = log x
x = 10^y
inversnya = 10^x
4) y = x² - 1
x² = y + 1
x = +-√y + 1
inversnya = √(x + 1) atau - √(x - 1)
semuanya punya invers