3 Find the distance between the points
P (cos a, -sin a) and Q(-cosa, sina).
using
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2
Answer:
answer is 2
Step-by-step explanation:
distance between two points= root over (x2-x1)²+(y2-y1)²
therefore root over root over (sina+sina )²+(-cosa-(cosa))²
=root over (2sina)²+(2cosa)²
according to trigonometric indentity sin²a+cos²a=1
therefore rootover 4(sin²a+cos²a)
=root 4
=2
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