Математика, Детальна інформація

2an= an-1 + an+1

an = a1 + d(n-1)

Sn = n(a1 + an )/2

Sn = (a1+d(n-1))n/2

Sn= a1 + a2 +...+an

Aaiiao\x00F0e/ia

bn = bn-1 ( q

b2n = bn-1( bn+1

bn = b1(qn-1

Sn= (bnq- b1)/(q-1)

Sn = b1 (qn-1)/(q-1)

S= b1/(1-q)





O\x00F0eaiiiiao\x00F0\x00B3y.

sin x = a/c

cos x = b/c

tg x = a/b=sinx/cos x

ctg x = b/a = cos x/sin x

sin ((-() = sin (

sin ((/2 -() = cos (

cos ((/2 -() = sin (

cos (( + 2(k) = cos (

sin (( + 2(k) = sin (

tg (( + (k) = tg (

ctg (( + (k) = ctg (

sin( ( + cos( ( =1

tg ( = cos( / sin( , ( ( (n, n(Z

tg( ( ctg( = 1, ( ( ((n)/2, n(Z

1+tg(( = 1/cos(( , ((((2n+1)/2