三角函式角--π/5

pi/5

theta=pi/5

x=sintheta

x

x^2

x=sin(pi/5)

cos(pi/5)

=

1/4(1+sqrt(5))

cot(pi/5)

=

1/5sqrt(25+10sqrt(5))

csc(pi/5)

=

1/5sqrt(50+10sqrt(5))

sec(pi/5)

=

sqrt(5)-1

sin(pi/5)

=

1/4sqrt(10-2sqrt(5))

tan(pi/5)

=

sqrt(5-2sqrt(5))

cos((2pi)/5)

=

1/4(-1+sqrt(5))

cot((2pi)/5)

=

1/5sqrt(25-10sqrt(5))

csc((2pi)/5)

=

1/5sqrt(50-10sqrt(5))

sec((2pi)/5)

=

1+sqrt(5)

sin((2pi)/5)

=

1/4sqrt(10+2sqrt(5))

tan((2pi)/5)

=

sqrt(5+2sqrt(5)).