sec50

+ =1/cos50+sin10/cos10 =2sin50/sin100+sin10/cos10 =[2sin(60-10)+sin10]/cos10 =(2sin60cos10-2cos60sin10+sin10)/cos10 =√3cos10/cos10 =√3. sec50+tan10 =csc40+cot80 =1/sin40+cos80/sin8…