Sb Sangpi
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 May1 accepted Solve for $x$ in $[-\pi,\pi]$ May1 comment Solve for $x$ in $[-\pi,\pi]$ @TheChaz so does the $x$ mean green lines from the above graph.thx May1 comment Solve for $x$ in $[-\pi,\pi]$ ok! i got it one, but the other is when I look to $\frac{-\sqrt{3}}{2}$ it is not cos anymore, it is in $sin$ area. May1 awarded Critic May1 asked Solve for $x$ in $[-\pi,\pi]$ May1 awarded Enthusiast Apr30 accepted How to differentiate $x+\sqrt{1-x^2}$ Apr29 accepted Find the value of $k$ when $x=1$ Apr29 comment How to differentiate $x+\sqrt{1-x^2}$ yea. $u=(1-x^2)^\frac{1}{2}$ and $y=u^\frac{1}{2}$ , it is right? Apr29 asked How to differentiate $x+\sqrt{1-x^2}$ Apr29 comment Find the value of $k$ when $x=1$ still $x=1$ is $\frac{-3k}{4}$ i can't get $-\frac{8}{3}$ Apr28 comment Find the value of $k$ when $x=1$ edited, still wrong? Apr28 comment Find the value of $k$ when $x=1$ edited, still can't get answer! thx Apr28 revised Find the value of $k$ when $x=1$ added 101 characters in body Apr28 comment Find the value of $k$ when $x=1$ edited mistake, still wrong? Apr28 asked Find the value of $k$ when $x=1$ Apr24 accepted How to find $h'(x)$, if $h(x) = f(g(x))$. Apr24 accepted Evaluate the $\sin$, $\cos$ and $\tan$ without using calculator? Apr23 revised Evaluate the $\sin$, $\cos$ and $\tan$ without using calculator? added 174 characters in body Apr23 asked Evaluate the $\sin$, $\cos$ and $\tan$ without using calculator?