oblicz cos2α wiedząc że tgα=4
prosze o pomoc...
cos2α=2cos²α-1
1=sin²α+cos²α i tgα=sinα/cosα
sinα/cosα=4
sinα=4cosα
16cos²α+cos²α=1
cos²α=1/17
cos2α=2/17-1= - 15/17
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cos2α=2cos²α-1
1=sin²α+cos²α i tgα=sinα/cosα
sinα/cosα=4
sinα=4cosα
16cos²α+cos²α=1
cos²α=1/17
cos2α=2/17-1= - 15/17