Answers

2016-02-21T19:50:59+05:30
The answer is a.

the sum is according to distance formula

= √(x₂-x₁)²+(y₂-y₁)²

= √(0-a cos 25)² + (a cos 65-0)

= √(a cos 25)² + (a cos  65)²

= √(a cos 25)² + (a sin 25)²

= √(a² cos²25) + (a² sin²25)

= √a²(cos²25 + sin²25)                  we know that  sin²Θ + cos²Θ = 1

= √a²(1)

= √a²

= a

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