log5 ctg16 + log5 tg16 = log5 (ctg16 * tg16)
Using the identity: ctg(x) * tg(x) = 1
log5 (1) = 0
Therefore, log5 ctg16 + log5 tg16 = 0.
log5 ctg16 + log5 tg16 = log5 (ctg16 * tg16)
Using the identity: ctg(x) * tg(x) = 1
log5 (1) = 0
Therefore, log5 ctg16 + log5 tg16 = 0.