Question

Cos^3 a-cos 3 a/cos a + sin^3 a
+sin 3 a /sin a=3
a=30
Cos 30 = √3/2. Sin 90 = 1
Cos 60 = 1/2. Sin 60 = √3/2
Cos 90 =0. Sin 30 = 1/2
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Answer 1

Answer:

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