1.

Find the principal value of tan -1 (tan 3π/4).

Answer»

tan -1 (tan 3π/4)

We know that

tan -1 (tan 3π/4) = tan -1 (tan[π – π/4])

= tan -1 (- tan π/4)

= – tan -1 (tan π/4)

= – π/4



Discussion

No Comment Found