the resultant of two force P and 10 KN is 15KN inclined 30 degree to the 10KN force find the magnitude and detection of force
i draw my sketch and try to use cosine rule but i can't find please help
i already see this question
but i can't understand
Find one of two forces, given their resultant
$\vec P + 10 \hat i = 15 \cos 30 \hat i + 15 \sin 30 \hat j$,
assuming the $10 KN$ force along the $x$ - axis; and $10KN$ and $P$ to be in the $xy$ plane. We can do that by shifting and rotating the imaginary axes if necessary as in your figure.
So $\vec P$ is ?