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Trigonometry jee
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34. let ABC be a triangle. If cos2A + cos2B + cos2C = – 1 then which one of the following is correct ?
(a) sinA sinB sinC = 0
(b) sinA sinB cosC = 0
(c) cosA sinB sinC = 0
(d) cosA cosB cosC = 0
Which of the above are correct?
(a) 1 and 3 (b) 1 and 2
(c) 1 and 4 (d) 2 and 3
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