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Kiely

Questions (3)

cos(3π/4+x) + sin (3π/4 -x) = 0= cos(3π/4)cosx + sin(3π/4)sinx + sin(3π/4)cosx - cos(3π/4)sinx = -1/sqrt2cosx +
1. 2 answers
2. 1,700 views
cos^2xcos^2y+sin^2xsin^2y+sin^2xcos^2y+sin^2ycos^2x = 1
1. 2 answers
2. 553 views
cos^4 x - sin^4 x = 1 - 2sin^2 xProve
1. 3 answers
2. 440 views