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Can anyone explain these math questions?? (40,49,58) : r/ACT

Prove thatsin (270^{circ} + A) = -cos A, and tan (270^{circ} + A

sin(90+a) × cos(180+a)/cos^2(a-180) × tg(a-270)​упростите

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Ответы Mail.ru: помогите пожалуйста !!!cos(90+a) tg(270+a)/cos(180

Sin ( 90 + a ) – Cos (180 + a) Sin ( 270 + a) =

sin (270^@ + x) cos^3 (720^@ -x) - sin(270^@-x) sin^3(540^@ +x))/(si

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