number of ways to pick 4 objects out of a group of 6

write (tan25 + tan40)/(1+tan25tan40) as a single trig function

what is the sum of the coefficients of (x + y)^7

single interior angle of regular dodecagon

how many prime numbers are there less than 100

what is the modulus of z = -6 + 8i

7!

Problem

Answer

finds a vector perpendicular to two other vectors in 3-space

how many faces does an icosahedron have?

write cos75cos24 + sin24sin75 as a single trig function

what is the Golden Ratio to 3 decimal places

how many petals does the rose curve y = 8sin5(theta) have?

what shape is used for the faces of a regular hexahedron

what is the sum of the coefficients of (x - y)^7

area of a parallelogram with sides of 6 and 9 and an included angle of 30 degrees

75^2

Numbers in the series: 1, 1, 2, 5, 14, 42, 132, 429..../gives number of ways a polygon with (n+2) sides can be cut into triangles w/straight lines/number of Dyck words of lenght 2n

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