1/(1+tg²α)=cos²α;cos2α=2cos²α-1
cos²α=1/(1+8/25)=25/33;
-132cos2α=-132*(2*25/33-1)=-132*17/33=-68
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1/(1+tg²α)=cos²α;cos2α=2cos²α-1
cos²α=1/(1+8/25)=25/33;
-132cos2α=-132*(2*25/33-1)=-132*17/33=-68