Question

solve que no. 2a
solve it

Answer 1

- sign is to be write where I used + sign while adding the integrals
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Answer 2

Let's use LaTex Maths equation editor.  When we create or answer a qn, we can click on the PIE symbol on the green border around this box. (there are other formatting buttons too: B, Omega, paperclip, use also Ctrl+I).
integral.

$I=\int {\frac{cos\theta}{sin\theta+\sqrt{sin\theta}}} \, d\theta\\\\let\ sin\theta=t^2.\ \ Cos\theta\ d\theta= 2t\ dt\\\\I=\int {\frac{2 t}{t^2+t}} \, dt=\int {\frac{2dt}{1+t}} \, dt\\\\=2Ln(1+t)+K\\\\=2Ln(1+\sqrt{sinx})+K$