Wiedząc, że sin²α+cos²α=1 wyrażenie można zapisać w postaci:
a)sinα
b)1
c)cosα
d)
1-sin²α 1-(1-cos²α 1-1+cos²α cos²α
----------- = ----------------- = ----------------- = ----------- = cosα
cosα cosα cosα cosα
Odp. c) cosα
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1-sin²α 1-(1-cos²α 1-1+cos²α cos²α
----------- = ----------------- = ----------------- = ----------- = cosα
cosα cosα cosα cosα
Odp. c) cosα