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Cofunction Identities Worksheets

Cos, cot, and cosec are cofunctions of sin, tan and sec, hence they are prefixed with "co". Highlighted here is the relationship between the basic trig functions whose arguments together make complementary angles. Learn the cofunction identities in degrees as well as radians from the trigonometric identities chart and practice exercises like solving and evaluating trigonometric functions. These printable handouts are designed for high school students. Grab a few worksheets for free!

Cofunction Identities

Incorporated here are tasks to determine the angle of a trigonometric function using the cofunction identities that make a sum of 90o or π/2 with the angle of its cofunction.

  • pdf 1
  • pdf 2
  • pdf 3

Equivalent Trigonometric Function Using Cofunction Identities

Tackle these two-part pdf worksheets featuring exercises to express a trigonometric function as an acute angle less than 45o or π/4 in Part A and greater than 45o or π/4 in Part B.

  • printable 1
  • printable 2
  • printable 3

Solve Using Cofunction Identities | Degrees

Specifically dealing with degrees, these printable worksheets encompass exercises to determine the value of 'x' by solving the trigonometric expression applying the cofunction identity.

  • practice 1
  • practice 2
  • practice 3

Solve Using Cofunction Identities | Radians

Use the complementary angle theorem to solve the trigonometric equations with the angle measures in radians in this set of high school pdf worksheets.

  • worksheet 1
  • worksheet 2
  • worksheet 3


Reiterate cofunction identities and apply them to evaluate trigonometric expressions involving a mix of degrees and radians.

  • exercise 1
  • exercise 2
  • exercise 3