sina*cosa*cos2a
a)sin4a/2
b)cosa
c) sin4a
d)sin4a/4
e)cos2a
sina*cosa*cos2a=sina*cosa*(cos^2 a - sin^2 a)=sina*cos^3 a-sin^3 a * cosa=== незнаю извини
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sina*cosa*cos2a=sina*cosa*(cos^2 a - sin^2 a)=sina*cos^3 a-sin^3 a * cosa=== незнаю извини