mnozenie, dodawanie siusów, cosinusów..

[Ankaaa993]

a)\(\displaystyle{ sin^{2}42+sin^{2}48=}\)


b)\(\displaystyle{ sin44\cdot sin44\cdot sin46\cdot sin46}\)

c)\(\displaystyle{ cos^{2}11+cos^{2}79}\)

[mmoonniiaa]

\(\displaystyle{ a) \ sin^242+sin^248=sin^242+sin^2(90-42)=sin^242+cos^242=1}\)
itd.