prove that sin 3a+ sin 5a+ sin 7a+sin 9a/cos 3a +cos 5a +cos 7a+ cos 9a=tan 6a
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sin sin a + Cos a by 6 sin a + 8 cos into sin a + b by sin cos a + b cos 38 + sin
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electron discovered by JJ Thomson electron is a negatively charged particle with absolute charge equal to minus 1.6 022 into 10 to the power 19 Columbus and mass equal to 9.1 09 into the power -31 kg aur 9.1 09 into 10 to the power minus 28 gram it is donated by e and it is related charge is taken as -1 while it is approxumate mass on unified scale is taken as 0 charge on electron was found by R.A mMillikan in 197 with the help of his oil drop experiment
an electron is a fundamental particle which carries 1 unit negative charge and has a mass nearly equal to 1/1837th of that of hydrogen atom
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