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May
2
accepted Calculate all the values of $x$ between $0$ and $2\pi$, without using calculator.
May
2
comment Calculate all the values of $x$ between $0$ and $2\pi$, without using calculator.
the answer is $\frac{\pi}{8}$ but I got $\frac{\pi}{4}$
May
2
revised Calculate all the values of $x$ between $0$ and $2\pi$, without using calculator.
added 2 characters in body
May
2
asked Calculate all the values of $x$ between $0$ and $2\pi$, without using calculator.
May
1
accepted Solve for $x$ in $[-\pi,\pi]$
May
1
comment Solve for $x$ in $[-\pi,\pi]$
@TheChaz so does the $x$ mean green lines from the above graph.thx
May
1
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.
May
1
awarded  Critic
May
1
asked Solve for $x$ in $[-\pi,\pi]$
May
1
awarded  Enthusiast
Apr
30
accepted How to differentiate $x+\sqrt{1-x^2}$
Apr
29
accepted Find the value of $k$ when $x=1$
Apr
29
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?
Apr
29
asked How to differentiate $x+\sqrt{1-x^2}$
Apr
29
comment Find the value of $k$ when $x=1$
still $x=1$ is $\frac{-3k}{4}$ i can't get $-\frac{8}{3}$
Apr
28
comment Find the value of $k$ when $x=1$
edited, still wrong?
Apr
28
comment Find the value of $k$ when $x=1$
edited, still can't get answer! thx
Apr
28
revised Find the value of $k$ when $x=1$
added 101 characters in body
Apr
28
comment Find the value of $k$ when $x=1$
edited mistake, still wrong?
Apr
28
asked Find the value of $k$ when $x=1$