Question

Ada yg tau cara 10 sama 11 ini, tolong yaa

Answer 1

10. cos a = -2/3 ==> x = -2, r = 3
y = √(3² - (-2)² = √(9 - 4) = √5
sin a = y/r = √5/3 =

11. sin (π + a) = p
sin π cos a + cos π sin a = p
0.cos a + (-1) sin a = p
-sin a = p
sin a = -p = -p/1 ==> y = -p, r = 1
x = √(1² - (-p)² = √(1 - p²)

cos a = x/r = √(1 - p²) /1 = √(1 - p²)...semoga membantu