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myrzilka [38]
3 years ago
5

Express the following as a function of a single angle. Cos^2(81°) - sin^2(81°)

Mathematics
1 answer:
kodGreya [7K]3 years ago
5 0

Answer:

= Cos(162°)

Step-by-step explanation:

Cos^{2}(81°) - Sin^{2}(81°)

we know that;

Cos^{2}(x°) - Sin^{2}(x°) = Cos(2x°)

Cos^{2}(81°) - Sin^{2}(81°) = Cos(2 * 81°)

= Cos(162°)

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