You need the identity ##sin(a+b)=sin(a)cos(b)+cos(a)sin(b)## Just plugging in the numbers ##sin(90+30)=sin(90)cos(30)+cos(90)sin(30)=cos(30)## Since ##sin(90)=1## and ##cos(90)=0##
##205.9sq.cm## Area of trapezium=##1/2(a+b)h=((a+b)h)/2## Where ##a and b=parall####e####l## ##sidesh=height## Now in an isoceles trapezium the legs are equal and in this case they are in a […]
##9## cubic meters Assuming the block is a perfect rectangular parallelepiped its volume is given by the equation: ##color(white)(XXX)volume = length xx width xx height## In […]
Use this chart to examine the similarities and differences between various . Key o.s. = opposite sides par = parallel cong. = congruent perp. = perpendicular
##arctan(-sqrt(3)/3) = tan^-1(-sqrt(3)/3) = tanx = -sqrt(3)/3## So basically what the problem asking you is that what angle on unit circle will give us ##-sqrt(3)/3## for […]