N
nhat2701
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
Bài 1/ Tính
a/ [tex]sin^2 15^o + sin^2 30^o + sin^2 45^o + sin^2 60^o + sin^2 75^o[/tex]
b/ [tex] cos^2 12^o + cos^2 23^o + cos^2 34^o + cos^2 45^o + cos^2 56^o + cos^2 67^o + cos^2 78^o[/tex]
c/ [tex]sin^2 15^o + sin^2 25^o + sin^2 35^o + sin^2 45^o + sin^2 55^o + sin^2 65^o + sin^2 75^o - 3[/tex]
d/ [tex]cos^2 1^o + cos^2 2^o + cos^2 3^o + ... + cos^2 88^o + cos^2 89^o[/tex]
e/ [tex]sin^2 10^o + sin^2 20^o + sin^2 30^o + ... + sin^2 80^o[/tex]
f/ [tex]cos^2 11^o + cos^2 17^o + cos^2 22^o + cos^2 73^o + cos^2 68^o + cos^2 79^o[/tex]
g/ [tex]\frac{sin 17^o}{cos 73^o}[/tex]
h/ [tex]tan 83^o - cot 7^o[/tex]
a/ [tex]sin^2 15^o + sin^2 30^o + sin^2 45^o + sin^2 60^o + sin^2 75^o[/tex]
b/ [tex] cos^2 12^o + cos^2 23^o + cos^2 34^o + cos^2 45^o + cos^2 56^o + cos^2 67^o + cos^2 78^o[/tex]
c/ [tex]sin^2 15^o + sin^2 25^o + sin^2 35^o + sin^2 45^o + sin^2 55^o + sin^2 65^o + sin^2 75^o - 3[/tex]
d/ [tex]cos^2 1^o + cos^2 2^o + cos^2 3^o + ... + cos^2 88^o + cos^2 89^o[/tex]
e/ [tex]sin^2 10^o + sin^2 20^o + sin^2 30^o + ... + sin^2 80^o[/tex]
f/ [tex]cos^2 11^o + cos^2 17^o + cos^2 22^o + cos^2 73^o + cos^2 68^o + cos^2 79^o[/tex]
g/ [tex]\frac{sin 17^o}{cos 73^o}[/tex]
h/ [tex]tan 83^o - cot 7^o[/tex]