Question

2 tan2 45° + cos2 30°-sin60°.​

Answer 1

We know that 

tan45∘=1,cos30∘=23,sin60∘=23 

∴2tan245∘+cos230∘−sin260∘ 

=2(1)2+(23)2−(23)2=2(1)=2 

∴2tan245∘+cos230∘−sin260∘=2