## Answers

**(a)**

**Solution:**

**(b)**

**Solution:**

**(c)**

**Solution:**

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cos 2r - cos 6.r = 0

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Solving each part separately sin (2.c) = 0 or sin (4.c) = 0 sin (2:) = 0 : r=an, in an sin (4:0) = 0 : x=2, x = @ + 2 tlak Combine all the solutions in = in, r = + an r = = < 1 +

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