Buktika (sin P + cos P )² = 1+2 sin P cosP

[tex] (sin p + cos p)^2 = 1 + 2 sin(p) cos (p) [/tex]
[tex] sin^2(p) + 2sin(p)cos(p) + cos^2(p) = 1+2sin(p)cos(p) [/tex]
[tex] 1 + 2sin(p)cos(p) = 1+2 sin(p)cos(p) [/tex]
QED.

Pakai rumus identitas pitagoras
Sin²p + cos²p = 1
Maaf kalau jawabannya salah