show that for complementary angles horizontal range is same in oblique projectile
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R=u^2sinacosa/9
For 90-a(complementary angle of a)
R=u^2sin(90-a)cos(90-a)/g
=u^2cosasina
For 90-a(complementary angle of a)
R=u^2sin(90-a)cos(90-a)/g
=u^2cosasina
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