14d) if a b c=πᶜ, prove that cosa.sinb.sinc cosb.sinc.sina cosc.sina.sinb = 1 cosa.cosb.cosc
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14e) if a b c=πᶜ, prove that sina.cosb.cosc sinb.cosc.cosa sinc.cosa.cosb = sina.sinb.sinc
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14d) if a b c=πᶜ, prove that cosa.sinb.sinc cosb.sinc.sina cosc.sina.sinb = 1 cosa.cosb.cosc
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14e) if a b c=πᶜ, prove that sina.cosb.cosc sinb.cosc.cosa sinc.cosa.cosb = sina.sinb.sinc
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if a b c = π , prove that: cosa.sinb.sinc cosb.sinc.sina cosc.sina.sinb=1 cosa.cosb.cosc
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