(34sin^2a)(13tan^2a)=(3tan^2a)(4cos^2a3)
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34sin^2a = (3sec^2a4tan^2a)*cos^2a = (3(tan^2a+1)4tan^2a)*cos^2a = (3tan^2a)*cos^2a
13tan^2a = 13(sec^2a1) = 43sec^2a = (4cos^2a3)/cos^2a
now just multiply and the cos^2a factors cancel 👍
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Steve
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