Seudónimo Seudónimo

21-09-2021
Mathematics

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cos s=-2/5 and sin t=4/5, s and t are in quadrant II
find cos(s+t) and cos(s-t)

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Sᴘᴀᴄᴇ7 Sᴘᴀᴄᴇ7

11-10-2021

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