Yang pinter matematika plis bantuin 1. cos 60 - cos 30 2. Sin 30 × cos 45 + cos 60 × tan 45 3. Tan 30 + sin 30 4. Sin 30 + sin 45 + sin 60

no.1

[tex] \frac{1}{2} - \frac{ \sqrt{3} }{2} \\ = \frac{1 - \sqrt{3} }{2} [/tex]

no.2

[tex] \frac{1}{2} \times \frac{ \sqrt{2} }{2} + \frac{1}{2} \times 1 \\ = \frac{ \sqrt{2} }{4} + \frac{1}{2} = \frac{ \sqrt{2} + 2}{4} [/tex]

no.3

[tex] \frac{ \sqrt{3} }{3} + \frac{1}{2} = \frac{2 \sqrt{3} + 3 }{6} [/tex]

no.4

[tex] \frac{1}{2} + \frac{ \sqrt{2} }{2} + \frac{ \sqrt{3} }{2} \\ = \frac{ 1 + \sqrt{2} + \sqrt{3} }{2} [/tex]