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How do you write the cos 18° in terms of the sine.

How do you write the cos 18° in terms of the sine.
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How do you write the cos 18° in terms of the sine.

How do you write the cos 18° in terms of the sine.-example-1
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User Artemn
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It's sine of 90-18, that is, sine of 72 degrees.
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User Caress
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