Вычислите sin4a ,если ctg2a=-2
sin4a=2sin2acos2a
1/sin^(2)2a=1+ctg^(2)2a
sin2a=+ - sqrt5/5
cos2a=+-2sqrt5/5
sin4a=-4/5
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sin4a=2sin2acos2a
1/sin^(2)2a=1+ctg^(2)2a
sin2a=+ - sqrt5/5
cos2a=+-2sqrt5/5
sin4a=-4/5