- #1
NooDota
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Let f(x) = tan(2x) - cot(2x) defined on x∈]0,π/4[
Prove that derivative of f(x) is 16/1-cos(8x)
What I did was:
2 * Sin^2(2x) + 2 * Cos^2(2x) / Cos^2(2x) + Sin^2(2x)
If I factor the 2, I reach:
2 * (Sin^2(2x) + Cos^2(2x) / 1+cos(4x)/2 + 1-cos(4x)/22 * 1/ 1 = 2?
What went wrong?
Prove that derivative of f(x) is 16/1-cos(8x)
What I did was:
2 * Sin^2(2x) + 2 * Cos^2(2x) / Cos^2(2x) + Sin^2(2x)
If I factor the 2, I reach:
2 * (Sin^2(2x) + Cos^2(2x) / 1+cos(4x)/2 + 1-cos(4x)/22 * 1/ 1 = 2?
What went wrong?