onegirl
Use a pythagorean Trig. Identity to simplify the function, then take derivative of this function. f(x) = 4x^2 tan x



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juanjohnguy
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We remember that tanx can be described as sinx over cos x

onegirl
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ok?

juanjohnguy
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I suppose that would simplify it a little bit if you dont know what the derivative of tanx is already but thats the only trig transformation I can see

onegirl
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okay so how would i do this?

juanjohnguy
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Well if you want to take the derivative of sinx over cosx then you would need to use the quotient rule

onegirl
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ok

onegirl
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i got sin(x))^2/(cos(x))^2 + 1

onegirl
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@zepdrix can u help?