Question

write cos 2x formula in terms of sinx,cosx,and in tanx ie all forms.​

Answer 1

Answer:

• $\cos(2x) = { \cos {}^{2} (x) }^{} - { \sin {}^{2} (x) }^{}$
• $\cos(2x) = 2 { \cos {}^{2} (x) }^{} - 1$
• $\cos(2x) = 1 - 2 \sin {}^{2} (x)$
• $\cos(2x) = \frac{1 - \tan {}^{2} (x) }{1 + \tan {}^{2} (x) }$