Hey!
Hope this helps... And we're super sorry that no answered your question...
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3sin^3 x * csc(x) + cos^2 x + 2cos(-x) * cos(x) = ?
3sin^3 x * (1/sin) + cos^2 x + 2cos(x) * cos(x) = ? We know 2cos(-x) = 2cos(x) because of the opposite angle theorem: cos(-x) = cos(x)
3sin^2 x + cos^2 x + 2cos(x) * cos(x) = ?
3sin^2 x + cos^2 x + 2cos^2 x = ?
sin^2 x + cos^2 x + 2cos^2 x = ?
3sin^2 x + 3cos^2 x = ?
3 (sin^2 x + cos^2 x) = ?
3 * 1 = ?
= 3
