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Question

What is the difference between 2cosx and cos2x?


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Solution

Difference between 2cosx and cos2x.

  • As the trigonometric function 2cosx is twice the trigonometric function cosx whereas trigonometric function cos2x is cosine of angle 2xthat is twice of angle x.
  • The range of trigonometric function 2cosx is between -2 and 2 whereas range of trigonometric function cos2x is between -1 and 1.

Thus, the trigonometric function 2cosx is twice the trigonometric function cosx whereas trigonometric function cos2x is cosine of angle 2x that is twice of angle x.


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