Question

tan48. tan 27 tan 42 tan 67 = sec²30 - tan^2 30​

Answer 1

here,

LHS = tan48. tan27. tan42. tan67.

(tan48. tan42.) (tan27. tan67.)

1. 1

1

RHS = sec²30 - tan²30

1. (bcz, 1 + tan²∅ = sec²∅)