1.prove that sinx.siny.sin(x-y) + siny.sinz.sin(y-z) + sinz.sinx.sin(z-x) + sin(x-y).sin(y-z).sin(z-x) = 0

2.f(α,β)= cos⁴α/cos²β + sin⁴α/sin²β then prove that f(α,β) = 1

^{3.cosA = tanB, cosB = tanC and cosC= tanA}

then show that sinA = sinB = sinC = 2sin18

manoj jangra

16 Years agoGrade 12