Question

If x=a sin a and y=a cos a then find the value of x2+y2

Answer 1

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Answer 2

Answer:

a^2

Step-by-step explanation:

x2+y2= (a sin a)^2 + (a cos a)^2

          = a^2 sin^2 a + a^2 cos^2 a

          = a^2 (sin^2 a + cos^2 a)

          = a^2 (1)

          =a^2