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yeh thanksuse the chain ruleeeeeeeeeee
so dy/dx = dy/du x du/dx
y = u^3
dy/du = 3u^2
u = tan3x
du/dx = 3sec^2(3x)
dy/dx = 3u^2 x 3sec^2(3x)
= 9(tan3x)^2(sec3x)^2