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