Saved Bookmarks
| 1. |
X-y/x+y=9 and xy/x+y=-60 Then find (x+y)+(x-y)+xy=??? 1 |
|
Answer» LHS = 1/COSEC A - cot A - 1/ SIN A= 1/cosec A cot A * cosec A + cot A/ cosec A + cot A 1/sin A= (cosec A + cot A)/(cosec^2A -cot^2A) - 1/sin A= (cosec A + cot A)/(cosec^2A - cot^2A) - cosec A= cosec A + cot A - cosec A= cot A.RHS = 1/sin A - 1/cosecA+COTA= cosecA - (cosecA - cotA)/ (cosec^2A - cot^2A)= cosec A - (cosec A-cot A)= cosec A - cosec A + cot A= cot A.LHS = RHS.Hope this helps! |
|