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4. Which trigonometric expression is equal to cos 72°? A. cos 55° B. cos 50° C. sin 61° D. sin 18°​

4. Which trigonometric expression is equal to cos 72°? A. cos 55° B. cos 50° C. sin 61° D. sin 18°​
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4. Which trigonometric expression is equal to cos 72°? A. cos 55° B. cos 50° C. sin 61° D. sin 18°​

4. Which trigonometric expression is equal to cos 72°? A. cos 55° B. cos 50° C. sin-example-1
asked
User Sisis
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8.3k points

1 Answer

3 votes

Answer:

D. sin 18°

Explanation:

sin 18 because 18 + 72 = 90

answered
User Wsaxton
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8.0k points
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