Вычислите: (3,65- 2 3/4) /3 + 17/40*12=

Question

Математика: Вычислите: (3,65- 2 3/4) /3 + 17/40*12=

milk051 · Accepted Answer

A) π/2 t π - 2-ая четверть cost - -  tgt и ctgt -  -  cost = -√(1-(4/5)²) = - √(1 - 16/25) = - √9/25 = -3/5 tgt = sint / cost = 4/5 : (-3/5) = -4/3 ctgt = 1/tgt = -3/4 б) 0 t π/2 - 1-ая четверть cost , tgt, ctgt -  +  cost = √(1-(5/13)²) = √(1- 25/169) = √(144/169) = 12/13 tgt= 5/13 : (12/13)=5/12 ctgt = 12/5  в) -π/2 t 0 - 4-ая четверть cost - +  tgt, ctgt - -  cost =  √(1-(-0.6)²) =  √(1-0.36) =  √0.64 =  0.8 tgt = -0.6 / 0.8 =  - 6/8 =  - 3/4 ctgt = - 4/3 г) π t 3π/2 - 3-я четверть cost - - ...

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