18°,36°,54°,72° of Sin and Cos#!#Questions

Use OF interval and illustration || Sin & Cos 18 degree , Sin & Cos 36 degree || Trigonometry identities with 3 angles and their derivation || Important Points

cos 72^@ - sin18^@ is equal to

sin 18^@-cos 72^@ is equal to : sin 18^@-cos 72^@ का मान क्या होगा ?

The ratio of two numbers is 3:1 and their sum is 72. Find the difference the numbers. A. 18 B. 36 C. 48 D. 54

The elements with atomic number 10, 18, 36, 54 and 86 are all