a.Without using the calculator, explain your steps in finding cot (−5r/6) b. Prove that (√(cosec?−1)/(cosec?+1))=(cot ? sin ?)/(1+sin ?) c. Solve 3 cos 2? + cos ? = 2 for 0 < ? < 360°.

Advanced Engineering Mathematics
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Chapter2: Second-order Linear Odes
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a.Without using the calculator, explain your steps in finding cot (−5r/6)
b. Prove that (√(cosec?−1)/(cosec?+1))=(cot ? sin ?)/(1+sin ?)
c. Solve 3 cos 2? + cos ? = 2 for 0 < ? < 360°.

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