kak tolong dijawab beserta caranya yaa

Nomor 37
tan θ = cot (90°- θ)
tan θ.cot θ = 1

log(tan 2°) + log(tan 3°) + ... + log(tan 88°)
= log(tan 2°.tan 3°. ... .tan 88°)
= log(tan 2°.tan 88°.tan 3°.tan 87°.....tan 45°)
= log(tan 2°.cot (90°- 88°).tan 3°.cot (90°- 87°).....tan 45°)
= log(tan 2°.cot 2°.tan 3°.cot 3°.......tan 45°)
= log(1.1........1)
= log(1)
= 0

Nomor 38 dan 39
Gambar terlampir