trig
By expressing 3x as (2x + x) prove that cos3x = 4cos^3x - 3cosx
trig
By expressing 3x as (2x + x) prove that cos3x = 4cos^3x - 3cosx
MATH
The eaves of a roof sloping at 23° overhand the walls, the edge of the roof being 75 cm from the top of the wall. The top of the wall is 5.4 metres above the ground. What is the height above the ground of the edge of the roof, to the nearest centimeter?
Math-approximation with fractions:7th grade math
yeah this is sooooo hard, does anyone understand? I got to do this for problems 14.-19. Its 7th grade math work page 4.5 Anyone got the same?
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