dy/dx = dy/du * du/dx
= 1/(2√u) * (-sin(x))
= -sin(x)/(2√cos(x))
y' = -sin(x)/(2√cos(x)).
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dy/dx = dy/du * du/dx
= 1/(2√u) * (-sin(x))
= -sin(x)/(2√cos(x))
y' = -sin(x)/(2√cos(x)).