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(sin + cos)^ = sin^ + 2sin cos + cos^ = 1 + 2 sin cos
2) tgα+cosα/(1+sinα)=
sin/cos +cos/(1 + sin) =
{sin(1+ sin) + cos^} / {cos(1+sin)} =
{sin + sin^ + cos^} / {cos(1+sin)} =
{ sin +1} / {cos(1 + sin)} =
1/cos
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^ oznacza do drugiej potęgi
w tych nawiasach sa liczniki i mianowniki { }
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a)tgα/(tgα+ctgα)=sin²α
tg + ctg = sin/cos + cos/sin = {sin^ + cos^}/{sin cos} = 1/{sin cos}
tg * {sin cos} = sin/cos * {sin cos} = sin²α
tożsamość
b)tgα+cosα/(1+sinα)=1/cosα
sin/cos + cos/(1 +sin) = 1/cos
{sin(1+sin) + cos^}/{cos(1+sin)} = 1/cos
{sin +1} / {cos(1+sin)} = 1/cos
1/cos = 1/cos
tożsamość