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16 cos^2([tex] -\frac{30}{2} [/tex])*(1-[tex] \sqrt{ \frac{(cos^230+1-sin^230)}{2} } [/tex])
16 cos^2([tex] -\frac{30}{2} [/tex])*(1-[tex] \sqrt{ \frac{(cos^230+1-sin^230)}{2} } [/tex])
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16*(1+cos30)/2*(1- √2cos^2(30)/2)=8*(1+cos30)*(1-cos30)=8*(1-сos²30)==8*sin²30=8*1/4=2