Why sin2x = 2sinx * cosx?
The positive metaphysical formula of sin (x + x) = SiNx * cosx + cosx * SiNx = 2sinx * cosx
RELATED INFORMATIONS
- 1. Sin2x-2sinx + cosx-1 = 0, solution X
- 2. The solution of sin2x-2sinx + cosx-1 = 0
- 3. It is known that cosx = - radical 3 / 3 and 18O degree
- 4. Cosx = - √ 3 / 3, and 180 is less than x, less than 270 ° the process of calculating sin2x, cos2x, tan2x is required
- 5. Monotone increasing interval of function y = 2 ^ (- x + 3x-2)
- 6. Finding monotone increasing interval of - x-3x + 2 of function y = 2
- 7. What is the monotone decreasing interval of known function y = - x2 square + 4x-3
- 8. The decreasing interval of function y = x2-6x is () A. (-∞,2]B. [2,+∞)C. (-∞,3]D. [3,+∞)
- 9. If the function y = x & # 178; - 6x is a decreasing function in the interval (- ∞, a), then the value range of a
- 10. If the function y = x ^ 2-6x + 4 is a decreasing function in the interval [0, M], then the value range of M is
- 11. (SiNx + cosx) / (SiNx cosx) = 3 find sin ^ 2 (x) + sinxcosx
- 12. If f (x + π) = f (- x), and f (x) = f (- x), then f (x) may be? Sin2x or cosx or sin [x] or [SiNx]
- 13. F (SiNx) = cos2x, the maximum value of F (x)
- 14. Find the maximum value of F (x) = (√ 3) SiNx + cos2x
- 15. If SiNx = 2cosx, then SiNx cosx / SiNx + cosx=_____
- 16. If f (SiNx) = 2-2cosx, then f (cosx) is equal to A、2-sin2x B、2+sin2x C、2-2cosx D、2+2cosx
- 17. Let f (x) = (SiNx) ^ 4-sinxcosx + (cosx) ^ 4, then the range of F (x) is
- 18. Given the function y = x2-4x-5, find the range when 1 x belongs to {- 10 1 2 3 4} and 2 x belongs to the range when [- 2 1]
- 19. The range of function y = - x ^ 2 + 4x + 1 is______ .
- 20. Find the function range: y = 2x-4x-2, X belongs to (- 1 / 2,2)