Q. 13

# If sec x cos 5x + cos 5x = -cos x

cos 5x+cos x = 0

We know Here Now from the above equation it would be,

2cos 3x cos 2x=0

cos 3x cos 2x=0

cos 3x=0 or cos 2x=0

for cos3x=0  for cos2x=0  so the values of the x less than equal to 90° are Rate this question :

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