sinx. Cosx. Cos2x= K has a solution, if K belong to the interval
sinx. Cosx. Cos2x= K has a solution, if K belong to the interval
ashish , 8 Years ago
Grade 12th pass
Trigonometry> sinx. Cosx. Cos2x= K has a solution, if ...
1 Answers
sonika p
sinx.cox.cos2x = k
Multiplying by 2 on both sides,
2*sinx.cox.cos2x =2* k
sin2x.cos2x = 2k
Multiplying by 2 on both sides,
2*sin2x.cos2x = 2*2k
sin4x = 4k
interval of sin4x, -1
therefore, -1
-1/4
interval of k is [-0.25,0.25]
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