Question

Y = cosseno de 120° + seno de 330 sobre cosseno de 180 calcule o valor das expressões​

Answer 1

cos120= -cos(180-120)= -cos60= -1/2

sen330= -sen(360-330)= -sen30= -1/2

cos180= -1

y=cos120+sen330/cos180

y= -1/2-1/2 /-1

y= -2/2 /-1

y= -1 / -1

y = 1 ✓