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macerbreak
@macerbreak
September 2021
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tg^2a + ctg^2a+2- 1/cos^2a
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Aigul9912
Cos²a+sin²a=1 |:cos²a
1+tg²a=1/cos²a
ctg²a+1=1/sin²a
tg²a+ctg²a+2-(1+tg²a)=tg²a+ctg²a+2-1-tg²a=ctg²a+1=1/sin²a
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Answers & Comments
1+tg²a=1/cos²a
ctg²a+1=1/sin²a
tg²a+ctg²a+2-(1+tg²a)=tg²a+ctg²a+2-1-tg²a=ctg²a+1=1/sin²a