Posted by Jane on Thursday, January 8, 2009 at 8:06am.
1) close, you left out the derivative of the base, so
dy/dx = - 1/ 3(sinx) ^4/3(cosx)
for 2)
rewrite it as
y = (8+sin(6x))^1/2
dy/dx = (1/2)((8+sin(6x))^-1/2)(cos(6x))(6)
= 3cos(6x)((8+sin(6x))^-1/2)
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