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Without using trigonometric tables, find...

Without using trigonometric tables, find the value of the following:
`((tan 20^(circ))/(cosec 70^(circ))^(2)) + ((cot 20^(circ))/(sec 70^(circ))^(2)) + 2tan 15^(circ) tan 45^(circ) tan 75^(circ)`

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