If sin (90 - θ) cos θ = 1 and θ is an acute angle, then θ = ______

Answer :

We have  : sin 90° - θ cos θ =  1cos θ . cos θ = 1cos2θ = 1cos θ = ±1cos θ = 1  or cos θ = -1θ = 0°  or  θ = 180°  rejected 

 

  • 0
then value of that angle is zerO.......
  • 3
Theta is zero Ans.........
  • 1
What are you looking for?