Diketahui
sin(x) + cos(x) = p ,
(sin(x) + cos(x) )²= p²
,sin²(x) + 2 sin(x) cos(x) +cos²(x) = p ²
2 sin(x) cos(x) = p ²-1
sin(x) cos(x) = ½(p ²-1)
maka
sin^4 x + cos^4 x=(sin²(x) +cos²(x))²
-2 sin²(x) cos²(x)
=1-2 sin²(x) cos²(x)
=1-2(½(p ²-1))²
=1-½(p ²-1)²
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Diketahui
sin(x) + cos(x) = p ,
(sin(x) + cos(x) )²= p²
,sin²(x) + 2 sin(x) cos(x) +cos²(x) = p ²
2 sin(x) cos(x) = p ²-1
sin(x) cos(x) = ½(p ²-1)
maka
sin^4 x + cos^4 x=(sin²(x) +cos²(x))²
-2 sin²(x) cos²(x)
=1-2 sin²(x) cos²(x)
=1-2(½(p ²-1))²
=1-½(p ²-1)²