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Physics

General

Easy

Question

$straight A with rightwards arrow on top equals$ 1+2j+2k, calculate the angle between $A with not stretchy rightwards arrow on top$ and Y axis

sin^-1 $\frac{\sqrt{5}}{3}$
sin^-1 $\frac{1}{\sqrt{3}}$
sin^-1 $\frac{\sqrt{10}}{3}$
cos^-1 $\frac{\sqrt{5}}{3}$

The correct answer is: sin^-1 $fraction numerator square root of 5 over denominator 3 end fraction$

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$A with not stretchy rightwards arrow on top$ and $Error converting from MathML to accessible text.$ are in opposite direction so they are

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then sum of the numbers in the set is

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then sum of the numbers in the set is

If $n$ is even, $S subscript n equals 1 squared plus 2.2 squared plus 3 squared plus 2.4 squared plus 5 squared plus 2.6 squared horizontal ellipsis n$ terms $equals fraction numerator n left parenthesis n plus 1 right parenthesis squared over denominator 2 end fraction$ , if $straight n$ is odd then $S subscript n equals$

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Central Rice Research Institute (CRRI) is situated at

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