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Actually, I too did the same and got an equation of 3rd power with complex roots :-)

But the problem is, I need this for my daughter who is in class 8 and they haven't learned complex numbers as yet....

I think that the teacher made a mistake in the question paper - she wrote 5 instead of 15 :-)

**vishalbhai**- Replies: 14

Hello!

Pls. help me find a way to calculate values like sin 5 & cos 10 ( the arguments are in degrees) without using tables or series...Just common formulas from grade 7-8 trignometry!!!

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