Question

need answer for 4c, 5a,5b,5c and 6

Answer 1

i have shown some steps which will help you solve the integrals using standard integration results.

For 6th question, mutliply the denominator and numerator with (secx - tanx). the denominator will simplify to 1 and you will be remaining with a simple expression in the numerator to integrate.

PS: there isnt any 5c in the image.

I hope you understand the approach.
All the best!