Làm thế nào để giảng dạy hiệu quả về hàm số cos^3x cho học sinh? cos^3x

Cos3x is an important identity in trigonometry, which is used to determine the value of the cosine function for an angle that is thrice the measure of angle x. (d) cos(3x)sin(3x)dx. ∫ . 5. Evaluate the integral. 0 exp(2sin )cos x x dx π. ∫ . 6. Evaluate cos(2 ) x x dx π π-. ∫. Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, ... The solution to the differential equation can be determined by multiplying both sides of the equation by an integrating factor. Sep 2, 2018 ... Cos^3(x)=(cos3x+3cosx) ÷4. Upvote ·. 9929. 91. ... by substitution: (a). Z x3 p x2 +2dx. (b*). Z x2 cos (x3)dx. (c). Z 1 x2 sin. 1 x dx. (d). Z cos(3x − 7) dx. (e). Z e√ x. √ x dx. (f*). Z e(x+ex) dx (use u = ex). 1/12 (cos (3x + 2)). 3 sin (3x +2)+1/8 cos (3x + 2) sin (3x +2)+3/8x + 1/4. But Maple does not do +C so the answer is: 1/12 (cos (3x + 2)). 3 sin (3x +2)+1/8 ... Apr 4, 2020 ... cos(x) cos(2x) cos(3x)···cos(nx)dx = 0? Problem 3. Suppose that k and n are positive integers, a1,a2,...,ak ∈ {1,2,...,n} and b1,b2 ... period y=sin(x)*cos(3x). Natural Language; Math Input. Have a question about using Wolfram|Alpha?Contact Pro Premium Expert Support ». ... cos(3x)°. What is the value of x? 1) 10. 2) 15. 3) 20. 4) 25. 19 If sin(2x + 7)° = cos(4x − 7)°, what is the value of x? 1) 7. 2) 15. 3) 21. 4) 30. 20 If sin(3x ...