determine the general solution:
2(sinxcosx - 1/2) =0
2} Write down the equation of q, if q is the result of p shifted 3 units to the right.
Note that when you distribute the 2, you have
$\displaystyle 2\sin x\cos x-1=0\implies \sin(2x)=1$
Thus, $\displaystyle 2x=\sin^{-1}(1)\implies 2x=\frac{(4k-3)\pi}{2};\,k\in\mathbb{Z}$
So it follows that $\displaystyle x=\frac{(4k-3)\pi}{4};\,k\in\mathbb{Z}$
Does this make sense?
When you shift a function $\displaystyle f(x)$ $\displaystyle n$ units to the right, you generate a function $\displaystyle g(x)=f(x-n)$. Use this idea to answer this part of the question.2} Write down the equation of q, if q is the result of p shifted 3 units to the right.
Hello Viky$\displaystyle 2(\sin x\cos x -\tfrac12)=0$
$\displaystyle \Rightarrow 2\sin x \cos x -1 =0$
$\displaystyle \Rightarrow \sin 2x = 1$, using the identity $\displaystyle \sin 2x = 2 \sin x \cos x$
Since $\displaystyle \sin \frac{\pi}{2} = 1$, one possible solution is $\displaystyle 2x = \frac{\pi}{2}$; i.e. $\displaystyle x = \frac{\pi}{4}$. But how do we find the general solution? Like this:
The positive values of $\displaystyle \theta$ that make $\displaystyle \sin\theta = 1$ are $\displaystyle \frac{\pi}{2},\frac{\pi}{2}+ 2\pi,\frac{\pi}{2}+ 4\pi, \frac{\pi}{2}+ 6\pi$, and so on.
Or we can go the other way and find negative values of $\displaystyle \theta$ by taking away multiples of $\displaystyle 2\pi$. So $\displaystyle \sin\theta = 1$ is also satisfied by $\displaystyle \theta = \frac{\pi}{2}- 2\pi, \frac{\pi}{2}-4\pi$, and so on.
Combining all these together we can say that the general solution of $\displaystyle \sin\theta = 1$ is:
$\displaystyle \theta = \frac{\pi}{2}+ 2k\pi, k = 0, \pm1, \pm2, \pm3, ...$
or simply $\displaystyle \theta = \frac{\pi}{2}+ 2k\pi, k \in \mathbb{Z}$, where $\displaystyle \mathbb{Z} = \{\text{integers}\}$
Now replace $\displaystyle \theta$ by $\displaystyle 2x$, and we get
$\displaystyle \sin 2x = 1$
$\displaystyle \Rightarrow 2x = \frac{\pi}{2}+ 2k\pi, k \in \mathbb{Z}$
Divide by 2:
$\displaystyle \Rightarrow x = \frac{\pi}{4}+ k\pi, k \in \mathbb{Z}$
This is equivalent to the answer that Chris L T521 gave you, but the values of $\displaystyle k$ start in a different place.
Grandad