(Cosα + 1)(Cosα - 1) = Cos²α - 1 = - Sin²α
task/29453819
Упростить выражение: (cos α + 1)(cos α -1)
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(cos α + 1)(cos α -1) = - ( 1+cos α) ( 1- cos α) =- ( 1² cos² α) = - sin² α .
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Verified answer
(Cosα + 1)(Cosα - 1) = Cos²α - 1 = - Sin²α
Verified answer
task/29453819
Упростить выражение: (cos α + 1)(cos α -1)
-----------------------
(cos α + 1)(cos α -1) = - ( 1+cos α) ( 1- cos α) =- ( 1² cos² α) = - sin² α .