Question

if cot A=7/8, than write value of (1+sinA)(1-sinA)/1+cosA)(1-cosA)

Answer 1

Cot A = 7/8 => cos A/sinA = 7/8 => (1+sinA)(1-sinA)/(1+cosA)(1-cosA) => (1-sin^2 A)/(1-cos^2 A) => cos^2 A/sin^2 A => (cos A/sin A)^2 => (7/8)^2 => 49/64