if x^(2) -2xcos(a) +1=0 and y^(2) -2ycos(b)+1=0
then 2cos(a+b) = ?
answer is xy + 1/xy .how is it??
my answer is coming x/y + y/x
if x^(2) -2xcos(a) +1=0 and y^(2) -2ycos(b)+1=0
then 2cos(a+b) = ?
answer is xy + 1/xy .how is it??
my answer is coming x/y + y/x
sanaa W , 12 Years ago
Grade 12
