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OpenStudy (anonymous):
Find two angles that satisfy the equation sin(3x + 9)° = cos(5x + 73)°. a.12;78 b.78;102 c.12;88
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hartnn (hartnn):
do you know the relation, sin x = cos (90-x) ??
hartnn (hartnn):
you use the relation and you get 90-(3x+9) = 5x+73 can you find x from here ??
OpenStudy (anonymous):
The two angels are complimentery (sum is 90) so (3x+9)+(5x+73)=90 8x+82=90 8x=8 x=1 subsitut x answer is 12 &78
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