trigonometry??

[iim_a_freak (meenakshi prasad)]

weightage of trignometry in cat 13?

[iim_a_freak (meenakshi prasad)]

weightage of trignometry in cat 13?

[surindertiwari]

If cot^2 (x) = cot (x - y) cot(x - z)

then show that cot (2x) = 1/2[cot(y) + cot(z)]