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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°​
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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
User Sisis
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1 Answer

3 votes
3 votes

Answer:

D. sin 18°

Explanation:

sin 18 because 18 + 72 = 90

User Wsaxton
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