Question

find the value of (sin77°/cos13°)2 + ( cos77°/sin13°)2 -2cos^2 45°​

Answer 1

Answer:

5/2

Step-by-step explanation:

=[sin(90°-13°)/cos13°]2+[cos(90°-13°)/sin13°]2-2(√3/2)^2

=(cos13°/cos13°)2+(sin13°/sin13°)2-2×3/4

=1×2+1×2-3/2

=2+2-3/2

=4-3/2

=8-3/2

=5/2 ans✓