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nadyushabondar
@nadyushabondar
August 2021
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СРОЧНО!!!
упростите выражение (cos 3 cos 12-sin 3 sin12)+(sin7 cos8+ sin8 cos7)^2 ,цифры внутри скобок это градусы!!!
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Inna1969
(cos 3 cos 12-sin 3 sin12)+(sin7 cos8+ sin8 cos7)^2
=(cos(3+12)+sin(7+8))^2=cos15^2+sin15^2+2
cos15sin15= 1+sin(2*15)=1+sin30
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=(cos(3+12)+sin(7+8))^2=cos15^2+sin15^2+2cos15sin15= 1+sin(2*15)=1+sin30