(m+5)x? +(5-2m)x+ 12=0
Listed by Vieta's theorem:
sinA+sinB= - (5-2m)/(m+5)①
sinAsinB= 12 /(m+5)②
Judging from the title, sinB=cosA
That is sin? A+ sin? B= 1 ③
M = (1 1 radical number 2 17)/2 can be obtained from ① ② ③.