tolong isi menggunakan caranya ( no 2 = a dan b ) ( no 3 = i )

2. (a)sin 60° × cos 30° + cos 60°× sin 30°
=0,86 × 0,86 + 0,5 × 0,5
=0,7396 + 0,25
=0,9896
[tex](b) 2 (tan \: 45 ) ^{2} + (cos \: 30) - (sin \: 60) ^{2} \\ = 2(1) ^{2} + (0.86) - (0.86) ^{2} \\ = 2 + 0.86 - 0.7396 \\ = 2.1204[/tex]
3.
[tex] \frac{2 \times \tan 30 }{1 + ( \tan30)^{2} } \\ = \frac{2 \times 0.57}{1 + 0.3249} \\ = \frac{1.14}{1.3249} [/tex]