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yanakolotova91
@yanakolotova91
July 2022
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помогите пожалуйста )))
упростите выражение sin (a - п/2) *cos (a-2п)+ 2tg (3п/2-а)*sin(п-а)* cos(4п+а)
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nafanya2014
Verified answer
Sin (a - п/2) = - sin(п/2 - а) = - cosa
cos (a-2п) = cos(2п-а) = cosa
tg (3п/2-а) = ctga
sin(п-а) = sina
cos(4п+а) = cosa
sin (a - п/2) *cos (a-2п)+ 2tg (3п/2-а)*sin(п-а)* cos(4п+а)=
= (-cos a)*cosa +2ctga *(sina)*cosa= - cos²a + 2cos²a = cos²a
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Answers & Comments
Verified answer
Sin (a - п/2) = - sin(п/2 - а) = - cosacos (a-2п) = cos(2п-а) = cosa
tg (3п/2-а) = ctga
sin(п-а) = sina
cos(4п+а) = cosa
sin (a - п/2) *cos (a-2п)+ 2tg (3п/2-а)*sin(п-а)* cos(4п+а)=
= (-cos a)*cosa +2ctga *(sina)*cosa= - cos²a + 2cos²a = cos²a