A general rule of arithmetic is \(\displaystyle a * 1 = a.\)How to prove sin 45 = 1/root 2 and root 2/2 same thing? I am confused.
How to prove sin 45 = 1/root 2 and root 2/2 same thing? I am confused.
I get 1Have you learned how to "rationalize the denominator"?
Multiply the numerator and denominator of \(\displaystyle \frac{1}{\sqrt{2}}\) by \(\displaystyle \sqrt{2}\), and see what you get.
Could you show that how do you get 'root p times root p = p?'A general rule of arithmetic is \(\displaystyle a * 1 = a.\)
Do you accept that?
Another general rule is
\(\displaystyle b \ne 0 \implies \dfrac{b}{b} = 1.\)
Still following?
Finally, a third rule of arithmetic is
\(\displaystyle c * d = 0 \iff c = 0 \text { or } d = 0.\)
Any problem so far?
\(\displaystyle \text {By definition, } \sqrt{p} * \sqrt{p} = p.\)
\(\displaystyle \therefore p \ne 0 \implies \sqrt{p} \ne 0 \implies \sqrt{2} \ne 0 \text { by third rule.}\)
\(\displaystyle sin(45^o) = \dfrac{1}{\sqrt{2}} \implies sin(45^o) = \dfrac{1}{\sqrt{2}} * 1 \text { by first rule.}\)
\(\displaystyle sin(45^o) = \dfrac{1}{\sqrt{2}} * 1 \implies sin(45^o) = \dfrac{1}{\sqrt{2}} * \dfrac{\sqrt{2}}{\sqrt{2}} \text { by second rule.}\)
\(\displaystyle \therefore sin(45^o) = \dfrac{1 * \sqrt{2}}{\sqrt{2} * \sqrt{2}} = \dfrac{\sqrt{2}}{2}.\)
Please tell us:Could you show that how do you get 'root p times root p = p?'
Of course you get 1, but you did NOT follow the direction which was to multiply the numerator AND denominator by sqrt(2). Now go and try again.I get 1
It is by definition as stated. You really can't argue about definition. I will try to show you why the definition makes sense.Could you show that how do you get 'root p times root p = p?'
We previously asked you to type sqrt() for square roots. Please try to memorize this notation.… how do you get root p times root p = p?
a^2 = a x aPlease tell us:
What is the definition of a^2?
What is the definition of \(\displaystyle \sqrt{a}\)?
What would you get from \(\displaystyle \sqrt{a} * \sqrt{a}\)?
The 2nd definition is wrong. The sqrt(a) is that special number that when you multiply it by itself will give you a. So sqrt(a)*sqrt(a) = aa^2 = a x a
(root) a = a^(1/2)
(root) a x (root) a = a^(1/2) x a^(1/2) = a^1 = a
Am I right?
sqrt(4) * sqrt(4) = 4sqrt(4) * sqrt(4) = ?
sqrt(9) * sqrt(9) = ?