Question

find the value of :

3sin² 30° + 2tan² 60° - 5cos² 45°

Answer 1

3 sin² 30° + 2 tan² 60° – 5 cos² 45° 

= `3(1/2)^2 +2(sqrt3)^2 – 5(1/2)^2 = (3)/(4)+6 –(5)/(2) = (3 + 24 – 10)/(4) = 4(1)/(4)`