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Neel
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I am an tenth standard student studying in St.Pius X High School (MULUND). http://www.theworldofstuff.com/characters/#a
Trigonometry Compound Angles?
The value of cos5° * cos25° * cos40° + sin5° * sin25° * sin40° - sin20° * sin40° is
a) √3 / 2
b) 1 / 2
c) 1 / √2
d) - √3 / 2
2 AnswersMathematics9 years ago