Question

13sina+14cosa деленная на 15 sina - 16 cosa если ctg=семь восьмых 

Answer 1

$\frac{13sina+14cosa}{15sina-16cosa}=frac{13frac{sina}{sina}+14frac{cosa}{sina}}{15frac{sina}{sina}-16frac{cosa}{sina}}=frac{13+14ctga}{15-16ctga}=\\=frac{13+14cdot frac{7}{8}}{15-16cdot frac{7}{8}}=frac{13cdot 8+14cdot 7}{15cdot 8-16cdot 7}=frac{202}{8}=25,25$