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Date: 14-8-2020
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Date: 22-8-2020
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Date: 6-2-2017
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Other formulas of spherical trigonometry
1. If s = (a + b + c)/2,
Obviously there are two variations of this, for sin B/2 and sinC/2.
2. By writing 180 − a for A, 180 − b for B, 180 − c for C, 180 − A for a, etc, in the four main
formulas, other useful formulas can be obtained. For example, using the cosine formula (1),
cos a = cos b cos c + sin b sin c cos A.......(1)
we obtain
cos A = −cos B cosC + sin B sin C cos a.
Proofs of these formulas will not be given here.
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دراسة تحدد أفضل 4 وجبات صحية.. وأخطرها
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جامعة الكفيل تحتفي بذكرى ولادة الإمام محمد الجواد (عليه السلام)
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