Saved Bookmarks
| 1. |
(sinA+cosecA)2+(cosA+secA)2=7+tan2A+cot2A |
| Answer» Taking LHS(SinA+CosecA)²+(CosA+SecA)²=Sin²A+Cosec²A+2sinAcosecA+Cos²A+2cosAsecA+sec²A=Sin²A+Cos²A+Cosec²A+Sec²A+2cosAsecA+2sinAcosecA=1+1+cot²A+1+tan²A+2cosA*1/cosA+2sinA*1/sinA=2+2+2+1+tan²A+cot²A=7+tan²A+cot²A | |