just checking, but would dy/dx of (cosx)<sup>3</sup> be -3(sinx)<sup>2</sup>???
L Lizzie Full Member Joined Sep 8, 2005 Messages 317 Nov 17, 2005 #1 just checking, but would dy/dx of (cosx)<sup>3</sup> be -3(sinx)<sup>2</sup>???
pka Elite Member Joined Jan 29, 2005 Messages 11,971 Nov 17, 2005 #2 That does not work Recall that \(\displaystyle f(x) = \left( {g(x)} \right)^3 \quad \Rightarrow \quad f'(x) = 3\left( {g(x)} \right)^2 g'(x)\)
That does not work Recall that \(\displaystyle f(x) = \left( {g(x)} \right)^3 \quad \Rightarrow \quad f'(x) = 3\left( {g(x)} \right)^2 g'(x)\)
L Lizzie Full Member Joined Sep 8, 2005 Messages 317 Nov 21, 2005 #3 So, it is -3(cosx)<sup>2</sup>(sinx)?
C crestu New member Joined Oct 27, 2005 Messages 13 Nov 21, 2005 #4 Lizzie said: So, it is -3(cosx)<sup>2</sup>(sinx)? Click to expand... That is correct.
