what is the difference between cos(-x) and -cosx
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In cos(-x) the angle is negative where as in -cosx angle is positive.
In cos(-x), Since angle is negative (<0°) It belongs to Quadrant IV
{∵ Negative angles ∈ Quadrant IV)
Where as -cosx may belongs to either Quadrant II or Quadrant III as it is positive in both first and fourth quadrants.
In cos(-x), Since angle is negative (<0°) It belongs to Quadrant IV
{∵ Negative angles ∈ Quadrant IV)
Where as -cosx may belongs to either Quadrant II or Quadrant III as it is positive in both first and fourth quadrants.
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