A. Prove that: (प्रमाणित गर्नुहोस्) 1 + tanA. tan2 A = sec2A
b. If cos 309 ।
5.prove that cos15° -52-va
भए c४४ 15-52-3 प्रमाणित गर्नु
यदी 60s30
C. Solve (हल गर्नुहोस्)
sin20-sin10 [050s360]​

The evening newspaper is delivered at a random time between 5: 30 and 6: 30 pm. dinner is at a random time between 6: 00 and 7: 00 pm. each spinner is spun 30 times and the newspaper arrived 19 times before dinner. determine the experimental probability of the newspaper arriving before dinner.