# Trigonometric Identities and Cofunctions of Complementary Angles

Find sin s

Cot s = -1 / 3, s in quadrant IV

Verify each trigoometric equation is an identity

Write each function value in terms of the cofunction of a complementary angle.

Find an angle Θ that makes each statement true

Find cos(s+t) and cos(s-t)

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Find sin s

(1) Cot s = -1 / 3, s in quadrant IV

Since s is in quadrant IV, then

(2)

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#### Solution Summary

Trigonometric Identities and Co-functions of Complementary Angles are investigated. The solution is detailed and well presented.

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