SOLUTION: Use half-angle formulas to find the exact values.
cos 165°
I got {{{sqrt(2+{{{(sqrt3)}}}/2 which is wrong.
This is my work:
165=θ/2
330= θ
cos θ/2= {{{sqrt(1+co
Algebra.Com
Question 1159668: Use half-angle formulas to find the exact values.
cos 165°
I got AMP Parsing Error of [sqrt(2+___(sqrt3)]: Invalid expression '___(sqrt3)': syntax error at /home/ichudov/project_locations/algebra.com/templates/Algebra/Expression.pm line 203.
.
/2 which is wrong.
This is my work:
165=θ/2
330= θ
cos θ/2= AMP Parsing Error of [sqrt(1+cos θ)]: Invalid function 'θ)': opening bracket expected at /home/ichudov/project_locations/algebra.com/templates/Algebra/Expression.pm line 70.
.
/2= AMP Parsing Error of [sqrt((1+(___sqrt(3)]: Invalid expression '___sqrt(3)': syntax error at /home/ichudov/project_locations/algebra.com/templates/Algebra/Expression.pm line 203.
.
/2)/2)}}}}}}= AMP Parsing Error of [sqrt(2+___(sqrt3)]: Invalid expression '___(sqrt3)': syntax error at /home/ichudov/project_locations/algebra.com/templates/Algebra/Expression.pm line 203.
.
}}}/2
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
=±
If is in the first or fourth quadrants, the formula uses the positive case:
If is in the second or third quadrants, the formula uses the negative case:
in your case angle is °-> the second quadrant
if °, ->°
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