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30.10.2020 •
Mathematics
HELP ME PLZ IM SO STRESSED UGH IM CHOOSING BRAINLEST ONLY IF U GET IT RIGHT
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Ответ:
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Ответ:
Ответ:
1/1-sinA+1/1+sinA
=(1+sinA+1-sinA)/{(1-sinA)(1+sinA)}
=2/(1-sin²A)
=2/cos²A [∵, sin²A+cos²A=1]
=2sec²A (Proved)
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