Question Number 56555 by Hassen_Timol last updated on 18/Mar/19
Commented by Hassen_Timol last updated on 18/Mar/19
$${Can}\:{you},\:{please},\:{answer}\:{me}\:{using}\:{somewhere} \\ $$$${the}\:{derivatives}...\:{in}\:\boldsymbol{{an}}\:\boldsymbol{{easy}}\:\boldsymbol{{way}}... \\ $$$${Thank}\:{you} \\ $$
Commented by mr W last updated on 18/Mar/19
$${Is}\:{the}\:{answer}\:{in}\:{Q}\mathrm{55362}\:{not}\:{clear}? \\ $$$${Do}\:{you}\:{have}\:{problem}\:{with}\:{method}\:\mathrm{1} \\ $$$$\left({without}\:{calculus}\right)\:{or}\:{with}\:{method}\:\mathrm{2} \\ $$$$\left({using}\:{calculus}\right)? \\ $$
Commented by Hassen_Timol last updated on 18/Mar/19
$${My}\:{maths}\:{teacher}\:{told}\:{me}\:{that}\:{the}\:{answer} \\ $$$${was}\:{not}\:{that}...\:{but}\:{he}\:{also}\:{told}\:{me}\:{that} \\ $$$${it}\:{was}\:{method}\:\mathrm{2}\:\left({calculus}\right)\:{that}\:{he}\:{was} \\ $$$${waiting}\:{for}... \\ $$$${There}\:{is}\:{maybe}\:{a}\:{mistake}\:{in}\:{method}\:\mathrm{2}... \\ $$
Commented by mr W last updated on 18/Mar/19
$${please}\:{ask}\:{your}\:{teacher}\:{if}\:{the}\:{figure} \\ $$$${above}\:{is}\:{correct}.\:{it}\:{is}\:{not}\:{clear}\:{when} \\ $$$${you}\:{say}\:``{A}\:{moves}\:{at}\:\mathrm{20}{km}/{h}\:{at}\:\mathrm{30}°\:{east} \\ $$$${and}\:{B}\:{moves}\:{at}\:\mathrm{30}°\:{west}\:{at}\:\mathrm{10}{km}/{h}''. \\ $$
Commented by mr W last updated on 18/Mar/19
Commented by mr W last updated on 18/Mar/19
$${since}\:{i}\:{got}\:{the}\:{same}\:{result}\:{with}\:\mathrm{2}\:{totally} \\ $$$${different}\:{methods},\:{i}\:{am}\:{quite}\:{sure} \\ $$$${that}\:{the}\:{result}\:{is}\:{correct}.\:{or}\:{you}\: \\ $$$${should}\:{specify}\:{what}\:{it}\:{meant}\:{with} \\ $$$${the}\:{move}\:{directions}\:{of}\:{A}\:{and}\:{B}. \\ $$
Commented by Hassen_Timol last updated on 18/Mar/19
$${Excuse}\:{me}\:{Sir},\:{I}'{ve}\:{asked}\:{him}...\:\mathrm{30}°{East}\:{and} \\ $$$${West}\:{are}\:{from}\:{the}\:{north}...\:{on}\:{the}\:{scheme}, \\ $$$${that}\:{would}\:{be}\:\mathrm{60}°... \\ $$$${But}\:{thank}\:{you}\:{very}\:{much},\:{I}'{ve}\:{used}\:{your} \\ $$$${method}\:{and}\:{at}\:{the}\:{end},\:{I}'{ve}\:{obtained}\:{two}\:{hours}... \\ $$$${Thank}\:{you}\:{Sir}... \\ $$