Let f(x)=1−sin2x+cos2x2cos2x and α+β=5π4. Then the value of f(α)⋅f(β) is
If sin α = 5/13 and sin β = 45 then the value of cos α cos β - sin α sin β is
If sin α, sin β, cos α are in GP, then roots of equation x2 sin β+2x cos β+sin β=0 are