document.write( "Question 924795: Using the exact values of the sine and the cosine of 1/6 pie and 3/4 pie and one of the sum and difference formulas. show sin(7/12 pie)is 1/4(sqrt2 + sprt6)?\r
\n" ); document.write( "\n" ); document.write( "i can work out the sin(7/12pie)=sin(1/4pie+1/3pie)=sin(1/4pie)cos(1/3pie)+cos(1/4pie)sin(1/3pie)=1/2sprt2*1/2+1/2sprt2*1/2sprt3=1/4(sprt2+sprt6)\r
\n" ); document.write( "\n" ); document.write( "i do not understand using the exact values of sin and cosin of 1/6 pie and 3/4pie???? \n" ); document.write( "

Algebra.Com's Answer #561088 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi
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document.write( "sin( 7π/12) = (1/4)(√2 + √6) is the exact value representation of sin( 7π/12)
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document.write( "that allows one to express sin( 7π/12) in terms of simple square roots rather 
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document.write( "than in using a decimal representation derived from a calculator.
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document.write( "...
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document.write( "Although calculators use irrational numbers such as π, √2 ,√3 etc...
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document.write( "the decimal calculations are never 'exact' (...best we can do is a 'rounded off' representation)
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document.write( "...........
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document.write( "θ	radians	sin θ	cos θ	tan θ
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document.write( "0°	0	0	1	0
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document.write( "30°	π/6	1/2	√3/2	√3/3
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document.write( "45°	π/4	√2/2	√2/2	1
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document.write( "60°	π/3	√3/2	1/2	√3
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document.write( "90°	π/2	1	0	─
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