Mathegoras

Trigonometry › Trigonometric identities › Complementary angles

Difference of squared sine and cosine

High school · ●○○○○ 10 pts

Evaluate (sin⁡72∘+cos⁡18∘)(sin⁡72∘−cos⁡18∘)(\sin 72^\circ + \cos 18^\circ)(\sin 72^\circ - \cos 18^\circ).

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cofunction identitiesdifference of squarestrigonometric functions