tan(theta) = 5/4
sin(theta)/cos (theta)=5/4
cos(theta)=4sin(theta)/5
sin²(theta)+cos²(theta)=1
sin²(theta)+16sin²(iheta)/25=1 /*25
25 sin²(theta)+16 sin²(theta)=25
sin²(theta)=25/41 /√
sin(theta)=\(\frac{-5 \sqrt{41} }{41}\)
cos(theta)=\(\frac{-4 \sqrt{41} }{41}\)
cot(theta)=\(\frac{4}{5}\)
csc(theta)=1/sin(theta)=\(\frac{- \sqrt{41} }{5}\)
sec(theta)=1/cos(theta)=\(\frac{- \sqrt{41} }{4}\)
