関連ワード:  sec theta tan theta is equal to x    if sec theta tan theta is equal to x    if sec theta plus tan theta is equal to x    if sec theta minus tan theta is equal to x    sec theta tan theta x then tan theta is equal to    sec theta tan theta x then sin theta is equal to    secant theta tan theta x then sec theta is equal to    secant theta tan theta x then secant theta is equal to    if sec theta tan theta x then tan theta is equal to    if sec theta tan theta x then sin theta is equal to