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19-01-2022
Mathematics

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if 1+ cos2a = 3 sin a cos a，cos a=/0 ，find tan a

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zoestout77 zoestout77

19-01-2022

Answer:

1−cos2A=43

⟹cos2A=1−43

⟹cos2A=44−3

⟹cos2A=41

⟹sec2A=4

⟹secA=±2

sorry if wrong

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