सिद्धान्तशिरोमणि: गणिताध्याय (भास्कराचार्य - ग्रहगणित, मध्यमाधिकार व स्पष्टाधिकार सटीक)

243 Co₃ = Ishta-hṛti = K/12 H cos z = (H cos z)/(H cos φ) = (cos z)/(cos φ) (11) Co₃ = Śanku-tala = s/12 H cos z = H cos z tan φ = (H cos z H sin φ)/(H cos φ) = R cos z tan φ (12). From the triangle PZS, we have the formula sin δ = sin φ cos z + cos φ sin z sin a written under verse 8 ∴ (sin δ)/(cos φ) = cos z tan φ + sin z sin a or in the Hindu form (R sin δ)/(cos φ) = H cos z tan φ + (H sin z H sin a)/R . I. We saw under verse 8 that (R sin δ)/(H cos φ) = (RH sin δ)/(H cos φ) = Agrajyā (formula 5). Also we have from (12) above H cos z tan φ = Śanku-tala. From fig. 40, if SM be drawn secondary to the prime-vertical, the right-angled spherical triangle SMZ gives [L14