=\frac{1}{2}&line2=\mathrm{Solution:\:}x=\frac{2%CF%80}{3}%2B2%CF%80n,x=2%CF%80n%2B2%CF%80 "cos(x-pi/3)= 1/2")
cos(x-pi/3)= 1/2
Example 22 - Prove cos2 x + cos2 (x + pi/3) + cos2 (x - pi/3)
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=1&line2=\mathrm{Solution:\:}x=%CF%80n%2B\frac{3%CF%80}{4} "tan(x-pi/2)=1")
tan(x-pi/2)=1
Ex 12.1, 22 - lim x->pi/2 tan 2x/x-pi/2 - Chapter 13 Class 11
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plotting - Why is Mathematica converting Sin(x + pi/2) to Cos(x)? - Mathematica Stack Exchange
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Wallis product - Wikipedia
![lim_[x- gtpi/2]cosx/[x-pi/2]` - YouTube](https://i.ytimg.com/vi/_GCXQ4Jqzp8/maxresdefault.jpg "lim_[x- gtpi/2]cosx/[x-pi/2]` - YouTube")