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misal : u = 16 - x² ------> x² = (16 - u)
du/dx = 2x
dx =
soal menjadi :
=
= . - .
= . - 32.
= (.u - 32) .
= (.u - 32) .
= {(16 - x²) - 32} .
= (24 - x² - 32).
= (- .x² - 8) .