Question

Tolong yang bisa jawab no.8

Answer 1

Tan50 = sin 50/cos 50
tan 50 = sin(85-35)/(cos(85-35)

sin (85-35)= sin 85 cos 35 + cos 85 sin 35 |
sin 50 = (xy -2)/(√(1+y²)(4+x²)

cos 50 = cos 85 cos 35 + sin 85 sin 35
cos 50 = (x + 2y)/√(1+y²)(4+x²)

tan 50 = sin 50/cos 50
tan 50 = (xy -2)/(x + 2y)