6/(1-cosα)=4√2/sinα这个方程怎么解?求α
问题描述:
6/(1-cosα)=4√2/sinα这个方程怎么解?求α
答
6/(1-cosα)=4√2/sinα;cosa≠1
36/(1-cosα)^2=32/(sinα)^2;
8(1-cosα)^2=9(1-(cosα)^2)
17(cosα)^2-16cosa-1=0; cosa≠1;
cosa=-1/17,
a=arccos(-1/17)