Question

数学题求各位帮帮忙已知tan(a-p)=1/2,tanp=-1/7,tan(2a-p)的值

Answer 1

tan2(a-p)=2tan(a-p)/1-tan^2(a-

p)=4/3 tan(2a-p)=tan[2(a-p) p]

=[tan2(a-p) tanp]/1-tan2(a-p)*tanp

=1

又因为 a,p 属于(0.π),则2a-p的值

π/4