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mohit04patil
@mohit04patil
August 2023
2
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cos21-sin21/cos21+sin21 = cot66
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kavitajimiwal245
Step-by-step explanation:
Step-by-step explanation:cos21-sin21/cos21+sin21 = cot66 6hfrrghh hai ki jo aaj ka paper and❤ I don't think you can do ome work
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Mysteryboy01
Verified answer
[tex] \frac{cos \: 21 ° - sin \: 21 °}{cos21 ° + sin21 °} = cot \: 66 ° \\ \\ = \frac{cos \: 21 °(1 - tan \: 21 °)}{cos \: 21 °(1 - tan \: 21 °)} \\ \\ = \frac{1 - tan \: 21 °}{1 + tan \: 21 °} \\ \\ = \frac{tan \: 45 ° - tan \: 21 °}{1 + tan \: 45 ° \: tan \: 21 °} \\ \\ = tan(45 ° - 21 °) \\ \\ = tan \: 24 ° \\ \\ = tan \: (90 ° - 66 °) \\ \\ = cot \: 66 °[/tex]
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Verified answer
[tex] \frac{cos \: 21 ° - sin \: 21 °}{cos21 ° + sin21 °} = cot \: 66 ° \\ \\ = \frac{cos \: 21 °(1 - tan \: 21 °)}{cos \: 21 °(1 - tan \: 21 °)} \\ \\ = \frac{1 - tan \: 21 °}{1 + tan \: 21 °} \\ \\ = \frac{tan \: 45 ° - tan \: 21 °}{1 + tan \: 45 ° \: tan \: 21 °} \\ \\ = tan(45 ° - 21 °) \\ \\ = tan \: 24 ° \\ \\ = tan \: (90 ° - 66 °) \\ \\ = cot \: 66 °[/tex]