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Answer:
her ist answer
Step-by-step explanation:
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If u and v are perpendicular, then their dot product is zero:

Solve for p :



Answer:

Step-by-step explanation:
Given
cosA =
= 
Then the opposite side using Pythagorean triple is 4, thus
sinA = 
Using the trigonometric identity
sin2A = 2 sinAcosA, then
sin2A = 2 ×
× 
=
= 