Archive
21st of September 2015
Mathematics
Q:

If cotA=n then find

msinA-ncosA/ncosA+msinA

Abhishek Sinha - CBSE - Class X

Sunday, September 20, 2015 at 09:29:AM

A:

G i v e n space t h a t space c o t A equals n rightwards double arrow fraction numerator cos A over denominator sin A end fraction equals n rightwards double arrow cos A equals n sin A... left parenthesis 1 right parenthesis N o w space c o n s i d e r i n g space t h e space g i v e n space e x p r e s s i o n comma space w e space h a v e comma fraction numerator m sin A minus n cos A over denominator n cos A plus m sin A end fraction equals fraction numerator m sin A minus n cross times n sin A over denominator n cross times n s i n A plus m sin A end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space equals fraction numerator sin A open parentheses m minus n squared close parentheses over denominator s i n A open parentheses n squared plus m close parentheses end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space equals fraction numerator open parentheses m minus n squared close parentheses over denominator open parentheses n squared plus m close parentheses end fraction

Monday, September 21, 2015 at 10:21:AM