Question

найдите ctg a, если
$frac{4sina - 3cosa}{2cosa + : 3sin : a} = 3$..

Answer 1

$frac{4sina : - 3cosa}{2cosa : + 3sina} = 3 \ 4sina : - 3cosa : = 6cosa + 9sina \ - 5sina : = : 9cosa \ frac{cosa}{sina} = - frac{5}{9} \ ctga = - frac{5}{9}$