a) cos 90° - 3 sin 90°= 0 – 3*1 = -3 b) 2sin 0°- cos² 180°= 2*0 – (-1)^2 = -1 c) cos² 0°- tg²180°= 1^2 – 0 = 1
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a) cos 90° - 3 sin 90°= 0 – 3*1 = -3
b) 2sin 0°- cos² 180°= 2*0 – (-1)^2 = -1
c) cos² 0°- tg²180°= 1^2 – 0 = 1