$\frac{1}{tg^{2}x}+\frac{1}{cot^{2}x}+\frac{1}{sin^{2}x}+\frac{1}{cos^{2}x}=7$
$\frac{1}{tg^{2}x}+\frac{1}{cot^{2}x}+\frac{1}{sin^{2}x}+\frac{1}{cos^{2}x}=7$
Started By Tran Nho Duc, 20-04-2014 - 16:28
lượng giác
#1
Posted 20-04-2014 - 16:28
Tran Nho Duc
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" Even if there was no Gravity on Earth, I'd still fall for you. "
Nunmul
#2
Posted 20-04-2014 - 16:29
Tran Nho Duc
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Tính $sin^{2}2x$ biết :
$\frac{1}{tg^{2}x}+\frac{1}{cot^{2}x}+\frac{1}{sin^{2}x}+\frac{1}{cos^{2}x}=7$
" Even if there was no Gravity on Earth, I'd still fall for you. "
Nunmul
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