jika tan x=1/3 maka sin (90+x) + tan (180+x)=

Trigonometri

tan x = 1/3
sin x = 1/√(1² + 3²) = 1/√10
cos x = 3/√10

sin (90 + x) + tan (180 + x)
= - cos x + tan x
= - 3/√10 + 1/3
= - 3/10 √10 + 1/3