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cos²α=1-sin²α
cos²α=1-(1-cos²α)
cos²α=1-1+cos²α
cos2α=cos²α
b) cos4α+sin4α=1-2sin²α×cos²α
L: (cos²α+sin²α)²-2sin²αcos²α(wzory skr. mnożenia)=(z jedynki tryg) 1-2sin²αcos²α=P