1.uprość wyrażenie. tgα cosα-sinα 2.udowodnij tożsamość 1/cos^α-1=tg^α
1)sin/cos*cos -sin=sin-sin=0
2)1/cos^α-cos^α/cos^α=1-cos^α/cos^α=sin^α/cos^α=tg^α
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1)sin/cos*cos -sin=sin-sin=0
2)1/cos^α-cos^α/cos^α=1-cos^α/cos^α=sin^α/cos^α=tg^α