Use the Given Function Value(s), and Trigonometric Identities (Including the Cofunction

question 129

Multiple Choice

Use the given function value(s) , and trigonometric identities (including the cofunction identities) , to find the indicated trigonometric functions.
sin 30° = $\frac { 1 } { 2 }$ , cos 30° = $\frac { \sqrt { 3 } } { 2 }$
sin 60° and cos 60°

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