значение песен военных лет

№1(Упростить)

[tex](\frac{sin \alpha}{tg \alpha} )^{2} + (\frac{cos \alpha}{ctg \alpha} )^{2} - 2 sin^{2} \alpha [/tex]

[tex]( \frac{sin \alpha - sin 3 \alpha}{cos \alpha - cos 3 \alpha } ) * (1 - cos 4 \alpha)[/tex]

№2(Вычислить)

[tex]\frac{tg \frac{\pi}{3}}{ctg \frac{\pi}{6}} - \sqrt{2} * cos \frac{3}{4} \pi [/tex]

[tex] \frac{sin 50^{0} + sin 10^{0}}{cos25^{0}* cos5^{0} +sin25^{0} * sin5^{0}} [/tex]

Помогите, пожалуйста!! 

Раскройте скобки, употребив the Present, Past of Future Continuous Tens. 

1. While Jane (to cook) I (to read) a book.

2. Martin isn’t here. He (to get) ready for the test now.

3. I (to read) from 5 to 6 tomorrow.

4. Excuse me, but you (to stand)  on my foot.