Proving an equation
D Deleted member 4993 Guest Sep 7, 2020 #2 SpaceTsunami said: View attachment 21481 Click to expand... Start with: sin(2θ) = 2∗sin(θ)∗cos(θ)\displaystyle sin(2\theta) \ = \ 2 * sin(\theta) * cos(\theta)sin(2θ) = 2∗sin(θ)∗cos(θ) ......... andcos(2θ) = 2∗cos2(θ) − 1\displaystyle cos(2\theta) \ = \ 2 * cos^2(\theta) \ - \ 1cos(2θ) = 2∗cos2(θ) − 1 Please show us what you have tried and exactly where you are stuck. Please follow the rules of posting in this forum, as enunciated at: https://www.freemathhelp.com/forum/threads/read-before-posting.109846/#post-486520 Please share your work/thoughts about this problem.
SpaceTsunami said: View attachment 21481 Click to expand... Start with: sin(2θ) = 2∗sin(θ)∗cos(θ)\displaystyle sin(2\theta) \ = \ 2 * sin(\theta) * cos(\theta)sin(2θ) = 2∗sin(θ)∗cos(θ) ......... andcos(2θ) = 2∗cos2(θ) − 1\displaystyle cos(2\theta) \ = \ 2 * cos^2(\theta) \ - \ 1cos(2θ) = 2∗cos2(θ) − 1 Please show us what you have tried and exactly where you are stuck. Please follow the rules of posting in this forum, as enunciated at: https://www.freemathhelp.com/forum/threads/read-before-posting.109846/#post-486520 Please share your work/thoughts about this problem.
