Kak, tolong bantu jawab dong nomor 6-9...pliss kak...

Kak, tolong bantu jawab dong nomor 6-9…pliss kak…

Jawab:

Penjelasan dengan langkah-langkah:

Gambar Jawaban

6.)
$cos(x ) + sin(x) = sqrt[]{ 2cos(x) } \ ( cos(x ) + sin(x) {}^{2} = 2 cos(x) \ cos{}^2x + sin ^2x + 2 cos(x) sin(x) = 2 cos(x) \ 1 + 2 sin(x) = 2 cos(x) \ 2 cos(x ) - 2 sin(x) = 1 \ 2( cos(x) - sin(x)) = 1 \ cos(x) - sin(x) = frac{1}{2}$
7.)
$( cos^{2} 15 ^{0} )^{2} - (sin^{2} 15 ^{0} )^{2} \ ( cos^{2} 15^{0} - sin ^{2} 15 ^{0} ) times ( cos^{2} 15^{0} + sin ^{2} 16 ^{0} ) \ cos : 2(15 ^{0}) times 1 \ cos : 30^{0} \ frac{1}{2} sqrt{3}$
no.8 dan 9 gatau, sorry yah :((

(smoga mmbantu)