sin kuadrat 60 derajat + cos kuadrat 60 derajat- 5. cos 90 derajat=

=sin^2 60° + cos^2 60° - 5.cos 90°
=(1/2√3)^2 + (1/2)^2 - 5.0
=3/4 +1/4 - 0
=4/4
=1