関連ワード:  is secant the same as cos^-1    is secant the same as cos 1    is sec the same as cos 1    is sec the same as cos inverse    is sec 2 the same as 1 cos 2    is sec 2x the same as 1 cos 2x    is secant 1/cos    is secant equal to cos^-1    is 1 over secant equal to cosine