Cot2a = tan(a-30)
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cot 2a = tan [ a - 30 ]
tan [ 90 - 2a ] = tan [ a - 30 ]
since
cot theta = tan [ 90 - theta ]
90 - 2a = a - 30
3a = 120
a = 40 degrees,
hope this helps...
tan [ 90 - 2a ] = tan [ a - 30 ]
since
cot theta = tan [ 90 - theta ]
90 - 2a = a - 30
3a = 120
a = 40 degrees,
hope this helps...
Answered by
1
Cot 2a = tan( a -30)
Tan (90-2a) = tan ( a-30).
{ AS TAN(90-A)= COT(A)}
=> 90-2 a = a -30
=>3a= 120
=>a= 40°
Tan (90-2a) = tan ( a-30).
{ AS TAN(90-A)= COT(A)}
=> 90-2 a = a -30
=>3a= 120
=>a= 40°
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