Solve the following:find the values of`2cos^2 60^@-sin^2 90^@`

The value of cos^2 45^@-sin^2 15^@ is

Solve the following:find the values of sin^2(pi/2)-cos^2(pi/2)+tan^2(pi/2)

Find the value of ^(90)C_2

Select and write the correct answer from the given alternatives in each of the following:Thevalue of sin^2(5^@)+sin^2(10^@)+sin^2(15^@)+………..+sin^2(85^@)+ sin^2(90^@) is equal to

Find the value of sin 30^(@)+cos 60^(@)

Find the value of sin^2 30+cos^2 60+tan^2 45 .

Find the value of 2 tan 45^@ + cos 30^@ - sin 60^@ .