Doubt from newtons laws of motion

@Shwetanshu_2018 bro , @Viram_2019 sir please see it...

Is the answer given in terms of φ , R and one more angle variable like Ѳ or Delta ?

only \alpha and \phi..
ans if \frac{cos\alpha}{sin^2{\phi}

I’m getting this

Can you share the answer given in the book

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