Search results
Nghi N. May 13, 2015 Replace cos 2x by \displaystyle{\left({2}{{\cos}^{{2}}{x}}-{1}\right)} f(x) = 2 + 3(2cos^2 x - 1) - cos x = 0. Call cos x = t. 6t^2 - t - 1 = 0. Solve by the ...
Rozwiąż równanie w przedziale . Skorzystamy ze wzoru na cosinus sumy. Szkicujemy cosinusa. Z wykresu widać, że. Skorzystamy ze wzoru. Szkicujemy tangensa. Z wykresu łatwo odczytać, że jedynym rozwiązaniem jest (bo ). Jeżeli natomiast , to możemy obie strony równania podzielić przez i otrzymujemy równanie. Szkicujemy sinusa.
Domi: Czyli 2x= π2 +kπ? 5-latek: OKres podstawowy y=cos (x) wynosi 2π. Teraz sprawdz ile jest rozwiazan w jednym okresie (czy tylko jedno ?
First, find out what the identities are for cos3θ and cos2θ in terms of cosθ. It looks like you know how to factorise - that ... Use the identity \cos^2 (x)=\frac {1+\cos (2x)} {2}. You should then be able to solve this for x by way of the inverse. Use the identity cos2(x)= 21+cos(2x).
Take the specified root of both sides of the equation to eliminate the exponent on the left side. cos(x) = ±√3 4 cos (x) = ± 3 4. Simplify ±√3 4 ± 3 4. Tap for more steps... cos(x) = ± √3 2 cos (x) = ± 3 2. The complete solution is the result of both the positive and negative portions of the solution. Tap for more steps...
Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor.
Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor.
