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Prove that: 1/(cos(x-a)cos(x-b))=(tan(x-...

Prove that: `1/(cos(x-a)cos(x-b))=(tan(x-b)-"tan"(x-a))/(sin(a-b))`

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(b) tan^(-1)((1-cos x)/(sin x))

tan^(-1)((1-cos x)/(sin x))