
no. 1no. 2Ralat Soalno. 3 cos2 (30◦) + cos2 (40◦) + cos2 (50◦) + cos2 (60◦) = cos2 (30◦) + cos2 (40◦) + sin2 (40◦) + sin2 (30◦) = 1 + 1 = 2 no. 4 g: (a + 2) + y(a – 2 )=0 → h: x(-1-3a)+y(5+3a)=5 → Karena garis g dan h saling tegak lurus, maka mg. mh= – 1 = – 1 – (a+2)(1+3a) = –( a–2)(3a+5) 3a2 + 7a + 2 = 3a2 – a – 10...