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Dear Sayem. The A↔ B means that A is equivalent to B (in other
words, A if and only if B). One takes only non-negative values of AB
because the measure of the side cannot be negative and the value of
sin C is also non-negative because C is an interior angle of the
triangle (that is, it is less than 180 degrees), hence its sine cannot
be negative.
Sayem
12.12.18, 17:42
in question 1 what do u mean by ↔ sign
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Dear Sayem. The A↔ B means that A is equivalent to B (in other words, A if and only if B). One takes only non-negative values of AB because the measure of the side cannot be negative and the value of sin C is also non-negative because C is an interior angle of the triangle (that is, it is less than 180 degrees), hence its sine cannot be negative.
in question 1 what do u mean by ↔ sign
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