If - - - - are in A-P- show that - - sin- - sin-cos- - cos-

We #10;have, #10; #10; α #10;,β ,γ are in A.P. #10; #10;So, #10; #10; 2β #10;=α +γ #160; #160; #160; #160; #160; #160; ...

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Arithmetic Mean

If α , β ,γ...

Question

If $α, β, γ$ are in A.P. show that $cot β = \frac{sin α - sin γ}{cos γ - c o s α} .$

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Solution

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