Question

please answer my question. It's in the photo I have attached.
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Answer 1

ANSWER

P(asinα,acosα) and Q(acosα,−asinα)

PQ=

(acosα−asinα)

2

+(−asinα−acosα)

2

=

a

2

(cosα−sinα)

2

+a

2

(sinα−cosα)

2

=a

2sin

2

α+2cos

2

α

=a

2

units.