TS EAMCET 19-July-2022 Shift 2 Solved Paper

Section: Mathematics
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Question : 25 of 160
 
Marks: +1, -0
If eit=cos‌t+i‌sin‌t and e−it=cos‌t−i‌sin‌t then cosh(x+iy)−cosh(x−iy)=
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