(1/tan)1/2+(1/tan)1/4
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=tan-1(1/2)
=(1/2). 2tan-1(1/2)
=(1/2). tan-1{(2.(1/2))(1-(1/2)2)}
=(1/2).tan-1(4/3)
=1/2 sin-1(4/5) by using the formula tan-1x=sin-1(x/sqrt(1-x2))
=(1/2). 2tan-1(1/2)
=(1/2). tan-1{(2.(1/2))(1-(1/2)2)}
=(1/2).tan-1(4/3)
=1/2 sin-1(4/5) by using the formula tan-1x=sin-1(x/sqrt(1-x2))
amber3:
how -1 come in first step
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