*Sin & cos as projections

*Sin & cos as projections

Actually cos & sin gives us an ideas of projections (shadows) of a line on x & y axis respectively. Consider a line of length L making an anticlockwise angle q with + x axis. Let Lx (= ON) &Ly (= OM) be its x & y projections, then

If θ is increased from 00 to 900, then cosθ decreases & sinθ increases.

sin2 θ + cos2 θ = 1

cosec2 θ – cot2 θ = 1

For integral values of n

Rate this post
error: Content is protected !!