1-2 tan a 12. If Sin( x-a)=Cos( x + a); prove that : tan x=1. 13. If x= Cos + Cos 20 and y = Sin + Sin20 . Show that :
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1-2 tan a 12. If Sin( x-a)=Cos( x + a); prove that : tan x=1. 13. If x= Cos + Cos 20 and y = Sin + Sin20 . Show that :
1-2 tan a 12. If Sin( x-a)=Cos( x + a); prove that : tan x=1. 13. If x= Cos + Cos 20 and y = Sin + Sin20 . Show that :
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