document.write( "Question 142444: Use sum or difference identities to find the exact value of each trigonometric function.\r
\n" ); document.write( "\n" ); document.write( "4.csc(915)degrees\r
\n" ); document.write( "\n" ); document.write( "6.sec(15)degrees\r
\n" ); document.write( "\n" ); document.write( "I tried this one on my own, could someone please, if possible verify that it is a right answer. sin (-165)degrees = (-radical6 + radical 2)/(-4)\r
\n" ); document.write( "\n" ); document.write( "Thanks for helping me!\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

Algebra.Com's Answer #103677 by stanbon(75887) $\"\"$ $\"About$

You can put this solution on YOUR website!
Use sum or difference identities to find the exact value of each trigonometric function.
\n" ); document.write( "4.csc(915)degrees
\n" ); document.write( "915-2*360 = 195
\n" ); document.write( "--------
\n" ); document.write( "csc(915) = csc(105+90) = [sin(105+90)]^-1 = [sin105*cos90 + cos105*sin90]^-1
\n" ); document.write( "[0 + cos105]^-1 = [-0.258819...]^-1 = -3.8637...
\n" ); document.write( "----------------\r
\n" ); document.write( "\n" ); document.write( "6.sec(15)degrees = [cos(45-30)]^-1
\n" ); document.write( "= [cos45cos30+sin45sin30]^-1
\n" ); document.write( "= [(sqrt(2)/2)(sqrt3)/2) + (sqrt2/2)(1/2)]^-1
\n" ); document.write( "= [sqrt(6)/4 + sqrt(2)/4]^-1
\n" ); document.write( "= [(sqrt(6)+ sqrt(2)/4]^-1
\n" ); document.write( "= 1.0353...
\n" ); document.write( "================
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "

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