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| 1. |
Cos^2 60 + 4sec^2 60 - tan^2 45 evaluate |
| Answer» Cos60°=1/2. ,sec 60°=2. ,tan 45°=1. (1/2)^2 + 4(2)^2 - (1)^2=1/4 + 16 - 1=1/4 +64/4 - 4/4= 61/4 . | |