Find the value of
if A + B + C = 0
(a) ½ cosA cosB cosC
(b) ¼ secA secB secC
(c) ½ secA secB secC
(d) ½ secA cosB cosecC
Sol:
As we know that: tanA + tanB + tanC = tanA tanB tanC
Sin2A + sin2B + sin2C = 4 sinA sinB sinC
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