Question
sinx+ siny/ (cosx+cosy)= tan 1/2 (x+y)
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prove the identity
(sinX)^6 +(cosX)^6= 1 - 3(sinX)^2 (cosX)^2
sinX^6= sinx^2 ^3 = (1-cosX^2)^3...
1. Prove the identity:cosx/1-tanx+sinx/1-cotx=sinx+cosx
2.Prove the identity: cosx/1+sinx+1+sinx/co...
How do I get (sinx cosy + cosx siny) (cosx cosy + sinx siny) in the form of 1/2(sin2x + sin2y)?
2tan^-1(tanx/2×tan(π/4-y/2))=tan^-1(sinx×siny/cosx+cosy)