Verify each trigonometric equation by substituting identities to match the right hand side of the equation to the left hand side of the equation.
1. cot x sec4x = cot x + 2 tan x + tan3x
2. (sin x)(tan x cos x - cot x cos x) = 1 - 2 cos2x
3. 1 + sec2x sin2x = sec2x
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1 cotx sec4x
=cotx(1+ 2tan2x+tan4x)
=cotx+2tanx+tan4x
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