May 2019 1 33 Report
Buktikanlah identitas trigonometri berikut:

1. Sin 7 a - sin 5 a / cos 7 a + cos 5 a = tan a

2. Cos ba - cos 4 a / sin ba - sin 4 a = -tan a

3. Sin a + sin 3 a / cos a + cos 3 a = tan 2 a

4. Sin 3 a - sin a / cos 3 a + cos a = -cotan 2 a

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