no. 1
no. 2
Ralat Soal
no. 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 |
| 8a | = | – 12 |
| a | = | – 1,5 |
no. 5
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