3 Look and circle the right word. My favourite
season is
summer / autumn !
There's a lot of
rain / wind!
129
266
Ответы на вопрос:
(25^cos x)^sin x= 5^cos x; (5^2cos x)^sin x = 5^ cos x; 5^(2 sin x * cos x = 5^cos x; 2 sin x* cos x = cos x; 2 sin x * cos x - cos x = 0; cos x( 2 sin x - 1) = 0; cos x = 0; ⇒ x = pi/2 + pi*k; k-z; 2 sin x - 1 = 0; sin x = 1/2; ⇒ x = (-1)^k * pi/6 + pi*k; k-z. x ∈ [ - 5pi/2; - pi]. x = - 5pi/2; - 11pi/6; - 3pi/2; - 7pi/6
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