Jawabanmu

2013-12-11T11:31:44+07:00
\cos 2p= \frac{7}{25}

2\cos^2 p-1= \frac{7}{25}

2\cos^2 p= \frac{7}{25} +1

2\cos^2 p= \frac{7+25}{25}

\cos^2 p= \frac{32}{25} \times  \frac{1}{2}

\cos^2 p= \frac{16}{25}

\cos p=  \sqrt{\frac{16}{25}}

\cos p=  \frac{4}{5}
cos positif karena p di kuadran 1
cos=samping per miring
gambar segitiganya, cari sisi depan, dpt 3
jadi
tan p = dpn / samping =  \frac{3}{4}