menentukan nilai 1 - cos² 60°

[tex]1 - { \cos(60) }^{2} = 1 - ( \frac{1}{2} ) {}^{2} \\ = 1 - \frac{1}{4} = \frac{4 - 1}{4} = \frac{3}{4} [/tex]
moga membantu folllw me..ikuti