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secondary 4 | A Maths
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Hello, need help with both part i and ii please
Date Posted: 4 years ago
Views: 202
converting to sines and cosines method for part i) :
tanx + 1/tanx
= sinx/cosx + cosx/sinx
= ((sinx)(sinx) + (cosx)(cosx)) / (sinxcosx)
= (sin²x + cos²x)/(sinxcosx)
= 1/(sinxcosx) (proved)
tanx + 1/tanx
= sinx/cosx + cosx/sinx
= ((sinx)(sinx) + (cosx)(cosx)) / (sinxcosx)
= (sin²x + cos²x)/(sinxcosx)
= 1/(sinxcosx) (proved)
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done
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First part
Date Posted:
4 years ago
thanks!
Alternatively you can convert your tangents to sines and cosines first. The intuition is that at the end of the day you have sines and cosines so perhaps you can convert everything to sines and cosines from the get go.
done
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Second part
Date Posted:
4 years ago
Thank you :)
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