Question

showthattan48tan23tan42tan67=1

Answer 1

HEY
HERE IS YOUR ANSWER
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tan48 tan23 tan42 tan67=1

LHS

tan48 tan42 tan23 tan67

tan48 tan(90-48) tan23 tan(90-23)

tan48 cot48 tan23 cot23

(tan48 1/tan48)( tan23 1/tan23)

1 × 1

=1
RHS proved
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