помогите решить пожалуйста!
[tex]8 { \cos( \alpha ) }^{2} - 9 \tan( \alpha ) {}^{2} + 3[/tex]
если здесь:
[tex] \sin( \alpha ) = \frac{1}{2} [/tex]
[tex]0 < \alpha < \frac{\pi}{2} [/tex]
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