by using rightangle triangle
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I'm sorry the question is not correctly displayed. If f(x) = cos(2x).cos(4x).cos(6x).cos(8x).cos(10x) then, find the limit of {1 - [f(x)]^3}/[5(sinx)^2] as x tends to 0 (zero).
Find the measure of this angles m1 equals 123 m8 equals?
cos 2x = cos2 x - sin2 x = 2 cos2 x - 1; whence, cos 2x / cos x = 2 cos x - (1 / cos x) = 2 cos x - sec x.
sec x = 1/cos x sec x cos x = [1/cos x] [cos x] = 1
180-x...... hahaahahaaa