Use of English Task 3. Complete the sentences with the correct
form of present continuous.
1. I am at zoo now. I
(watch) dolphins.
2. We
(do) homework.
3. My mum
(sit) in the living room
4. Alan and Asel
(play)in the
garden.
127
181
Ответы на вопрос:
cos² (x) + sin² (x) = 1
2*sin (x) * cos (x) = sin (2x)
cos⁴ (2x) + sin⁴ (2x) = cos⁴ (2x) + 2*sin²(2x)*cos²(2x) + sin⁴ (2x) - 2* sin²(2x) * cos²(2x) = (cos² (2x) + sin² (2x))² - 4* sin²(2x) * cos²(2x) /2 = 1² - (2*sin(2x) * cos(2x))² = 1 - sin² (4x)/2
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