Tentukan nilai limit fungsi trigonometri berikut A. Lim x → phi/6 ( cos^2 x - sin^2 x) B. Lim x → phi/3 Tan 2x / x

Limit trigonometri

a. lim (x-> pi/6)  cos²x -  sin² x
sub x = pi/6
= (cos pi/6)² - (sin pi/6)²
= (¹/₂√3)² - (¹/₂)²
= 3/4 - 1/4
= 2/4
= 1/2

b. lim(x-> pi/3)  tan 2x / x
= tan (2/3 pi) / (pi/3)
= - 3/(2pi)