26cos(3p/2 - а)=26(cos3p/2*cosa+sin3p/2*sina)=-26sina
sin^2a=1-cos^2a
sin^2a=144/169
sina=12/13
-26*12/13=-24
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26cos(3p/2 - а)=26(cos3p/2*cosa+sin3p/2*sina)=-26sina
sin^2a=1-cos^2a
sin^2a=144/169
sina=12/13
-26*12/13=-24