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Show that: cotx-cot2x=2...

Show that: `cotx-cot2x=2`

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Show that: cot x-cot2x=2

If sin^4x+sin^2x=1 show that, cot^4x+cot^2x=1

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If tan^(2)z= tan (x+y) tan (x-y) , show that cot^(2)y+ cot (z+x) cot (z-x)=0