(82)^(2)-(18)^(2)

Which of the following end with digit 1?123^(2),77^(2),82^(2),161^(2),109^(2)

Using the formula a^2 - b^2 = (a + b) (a - b) . Let's find the values (82)^2 -(78)^2

The value of cot (82(1)/(2))^(@) is-

(123)^2,(77)^2,(82)^2,(161)^2,(109)^2 .Which would end with digit 1 ?

Find the value of sin^(2)82(1)/(2^(@))-sin^(2)22(1)/(2^(@))

sin^(2)""(pi)/(18)+sin^(2)""(2pi)/(18)+sin^(2)""(4pi)/(18)+sin^(2)""(8pi)/(18)+sin^(2)""(7pi)/(18)+sin^(2)""(5pi)/(18)=

tan 82(1^(@))/(2)=

cos15^(@)cos7""(1)/(2)""^(@).cos82""(1)/(2)""^(@)=?

Find the value of sin^(2)82 1/2-sin^(2)22 1/2 .