lim x->π cos3x adalah.

cos 3x

1 - 2 sin^2 (3/2 x)
1 - 2 sin^2 (3/2 180)
1 - 2 sin^2 (270)
1 - 2 sin 270 × sin 270
1 - (2 × -1) (-1)
1 - (-2) (-1)
1 - (2)
1 - 2
= -1

Semoga Membantu

Lim cos3x
x→ π

= cos 3( π)

= cos 3 (180)

= cos 540

= -1