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Prove the identity 2 sin(x-y) sinx cos x sin 2 y sin y cos y that: Hence or otherwise show, WITHOUT USING A CALCULATOR, 1.2.1 1.2.2 1.2.3 Prove that: 4 cos6y= 4 cos 36° = sin15y sin 3y 1 cos15y cos3y sin 18° sin 18° is a solution for the cubic equation: 8k³ - 4k+1=0 sin.x+2cos(x+30*)=v3cosx​

Prove the identity 2 sinxy sinx cos x sin 2 y sin y cos y that Hence or otherwise show WITHOUT USING A CALCULATOR 121 122 123 Prove that 4 cos6y 4 cos 36 sin15y class=

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