Haunting at trigonometric equations.

Geometry Level 4

Find the number of real solution of the equation cos ⁡ 7 x + sin ⁡ 4 x = 1 \cos ^{ 7 }{ x } +\sin ^{ 4 }{ x } =1 in the interval [ − π , π ] \left[ -\pi ,\pi \right] .


The answer is 3.

Shivamani Patil by shivamani patil , 21, India

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1 solution

Yashas Ravi
Mar 22, 2019

0 Helpful 0 Interesting 0 Brilliant 1 Confused

Hey , the second step?

Hitesh Yadav - 10 months, 3 weeks ago

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