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Emiann222
16.12.2021 •
Mathematics
Which of the following is an identity?
A. sin^2x=4-2cos^2x
B. sec x tan x-cos xcot x+sin x
C. (tan x+cot x)(sin x cos x)=1
D. cos x(2sin x+1)=0
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Ответ:
3
Step-by-step explanation: