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tan theta = 1/2, what's sec theta?

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tanØ = 1/2

sketch a right-angled triangle with base angle Ø,
opposite as 1 and adjacent as 2
by Pythagoras, the hypotenuse^2 = 1 + 4 = 5
hypotenuse = √5

cosØ = 2/√5
secØ = √5/2

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