Question

find thetawhen 2cos theta=1 ( 0º

Answer 1

2cos theta = 1

2 ( 1 / 1 + tantheta) = 1 { sec theta =1 + tanthata) Nd sec theta = 1 / costheta}

=> 2 = 1 + tantheta

=> tantheta = 1

=> tan theta = tan 45

theta = 45°