Answer:
C 28
Step-by-step explanation:
Put the given value where x is in the expression and do the arithmetic.
-2(3(-3) -2) +(-3) +9
= -2(-9 -2) -3 +9
= -2(-11) -3 +9
= 22 -3 +9
= 19 +9
= 28
given that A, B and C are angle of a triangle prove that:<br /> sin B + sin C = 2cos A/2 cos B-C/2
1 answer:
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