Question

if 2sinα(90-Φ)*cosΦ=1then find Φ

Answer 1

Answer:

sin (90°-@) =cos @

so,

[email protected]@=1

cos^2@= 1

cos@= +1 or -1

cos@= cos 0° or cos 180°

@= 0 ° or 180° (ans)