Question

2(cos^4 60°+ sin^4 30°)-(tan^2 60° + cot^2 45)+3sec^230=1/4​

Answer 1

ansWer 딧ㅈㅅ

2(cos460∘+sin430∘)−(tan260∘+cot245∘)+3sec230∘

=[(21)4+(21)4]−[(3)2+(1)2]+3(32)2

=(161+161)−(3+1)+3×34=2×81−4+4=41