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How to find the cosine of 81 in terms of sine?

How to find the cosine of 81 in terms of sine?
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3 votes
How to find the cosine of 81 in terms of sine?

User Carl Verbiest
by
8.1k points

1 Answer

6 votes

Answer:

Explanation:

The cosine of angle Ф is √(1 - sin²Ф), which is positive if our angle 81 degrees is in Quadrant I.

sin 81° = 0.9877, so (sin 81°)² = 0.9755, and

cos 81° = 1 - 0.9755 = 0.0245

User Lee Armstrong
by
7.2k points
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