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Can someone solve these questions please? I'm not getting the solution.
cos22.5 can be found out using the formula(cos2x+1)/2= cos^2x just put x=22.5 and note that cos45= 1/√2.Also tan7.5 can be found out using tan2x= 2tanx/(1-tan^2x). We know that tan30=1/√3. So find tan15. And then find tan7.5In the middle question usecos 2x= 2/(1+tan^2x) - 1
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