sin + cos= 4/5
Wyznacz : sin x cos= ?
(sin+cos)²=sin²+cos²+2sincos
(sin+cos)²=1+2sincos
(4/5)²=1+2sincos
16/25-1=2sincos
-9/25=2sincos
-9/50=sincos
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(sin+cos)²=sin²+cos²+2sincos
(sin+cos)²=1+2sincos
(4/5)²=1+2sincos
16/25-1=2sincos
-9/25=2sincos
-9/50=sincos