20. secxsinx+cos(π2−x)1+secx
sinx
Step 1 :secxsinx+cos(π2−x)1+secx
Step 2 :1cosxsinx+cos(π2−x)1+1cosx
Step 3 :sinxcosx+sinxcosx+1cosx
Step 4 :sinx(1+cosx)1+cosx
Step 5 :sinx