Question

if m= cos/cos and n= cos/sin,show that (m2 + n2) cos2=n2

Answer 1

m=1 and n=cota. {1+cot²a}cos²a=cot²a (1+cot²a)cos²a=cos²a/sin²a 1+cos²a/sin²a=1/sin²a sin²a + cos2a/sin²a=1/sin2a 1/sin²a=1/sin²a