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Evaluate: (secthetacos e c(90^0-theta)-t...

Evaluate: `(secthetacos e c(90^0-theta)-tanthetacot(90^0-theta)+sin^2 55^0+sin^2 35^0)/(tan10^0tan20^0tan60^0tan70^0tan80^0)`

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Without using trigonometric tables, evaluate each of the following: (-tanthetacot(90^0-theta)+secthetacos e c(90^0-theta)+sin^2 35^0+sin^2 55^0)/(tan10^0tan20^0tan30^0tan70^0tan80^0)

Evaluate : tan7^0tan23^0tan60^0tan67^0tan83^0

Prove that tan20^0tan40^0tan80^0=tan60^0

Prove that: tan20^0tan40^0tan80^0=tan60^0

Evaluate : cos e c(65^0+theta)-sec(25^0-theta)-tan(55^0-theta)+cot(35^0+theta)

Prove that: t a n 20^0tan40^0tan60^0tan80^0=3

Evaluate : tan35^0tan40^0tan45^0tan50^0tan55^0

Prove tan 20^0 tan 30^0 tan 40^0 tan 80^0=1

Prove that tan70^0=2tan50^0+tan20^0

tantheta+tan(9 0^(@)-theta)=secthetaxxsec(9 0^(@)-theta)

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