関連ワード:  cot inverse tan theta is equal to    1 cot theta tan theta is equal to    tan inverse θ cot inverse theta is equal to    cot 2 theta 1 tan 2 theta is equal to    tan inverse cot theta is equal to 2 theta    if tan inverse cot theta is equal to 2 theta    tan inverse cot theta 2 theta then theta is equal to    if tan inverse cot theta theta then theta is equal to    is cot the inverse of tan    tan inverse equal to cot