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cot^2 6 0^0+sin^2 4 5^0+sin^2 3 0^0+cos^...

`cot^2 6 0^0+sin^2 4 5^0+sin^2 3 0^0+cos^2 9 0^0=13/12`

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Show that sin^2 3^0+sin^2 6^0+sin^2 9^0++sin^2 90^0=15 1/2dot

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cos^2 48^0-sin^2 12^0 is equal to

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The value of sin^2 12^0+sin^2 21^0+sin^2 39^0+sin^2 48^0-sin^2 9^0-sin^2 18^0 is _______

The value of sin^2 12^0+sin^2 21^0+sin^2 39^0+sin^2 48^0-sin^2 9^0-sin^2 18^0 is _______