Question

* In a right angled triangle ABC
angled at B It cot A: 1
prove that 2sina.Cosa = 1
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Answer 1

Answer:

given cot A =1

then tanA =1, sin A=1/root2 , cos A = 1/ root 2

consider 2sina cosa = 2×1/root2 ×1/root2

2/2=1