1) 1-cos2x=2sin²x 1+cos2x=2cos²x 2) 2sin²x/2cos²x = tg²x tg²x = tg²x
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1) 1-cos2x=2sin²x
1+cos2x=2cos²x
2) 2sin²x/2cos²x = tg²x
tg²x = tg²x