Show that (sin^2 45-tan^2 45)^2+3(sin^2 90+tan^2 30)=17/4? Share with your friends Share 1 Rishabh Mittal answered this To Show:-sin245-tan2452+3sin290+tan230=174LHSsin245-tan2452+3sin290+tan230=122-122+312+132=12-12+31+13=-122+33+13=14+4=1+164=174=RHSHence Proved. 2 View Full Answer