Устонови соответствие :1) sin 2 a ,2)cos a/2 ,3)tg 2 a ,4)1-sin^2 a,5)tg a/2;.а)
[tex] \frac{ + }{} \sqrt{ \frac{1 - cos \: a}{2} } [/tex]
в)
[tex] \frac{2 \: tg \: a}{1 - {tg}^{2} a} [/tex]
с)
[tex] {cos}^{2} a[/tex]
d)
[tex]2 \: sin \: a \: cos \: a[/tex]
e)
[tex] \frac{ + }{} \sqrt{ \frac{1 + cos \: a}{2} } [/tex]
СРОЧНО!!!​
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