July 2022 1 4 Report
СРОЧНО

Упростите
1) cos(a-b)+cos a sin b
2) 1/2sin a+cos(п/6+a)
3)Докажите тождество cos(a+b)+cos(a-b)=2 cos a cos b
4)Решите уравнения
cos2xcosx-sin2xsinx=0
tgx+tg2x/1-tgxtg2x=1
5)sina=12/13 и 0
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