" What is the value of "cos^(2)67^(@)-sin^(2)23^(@)" ? "

What is the value of cos^(2)31^(@)-sin^(2)59^(@)

If cos 47^@ + sin 47^@ = k , then what is the value of cos^2 47^@ - sin^2 47^@ ?

Answer the following by a number or a word or a sentence : What is the value of (sin^(2)22^(@)+sin^(2)68^(@))/(cos^(2)22^(@)+cos^(2)68^(@))+sin^(2)63^(@)+cos63^(@)sin27^(@) ?

State weather each of the following statements is true or false : The value of cos^(2)23^(@)-sin^(2)67^(@) is positive.

What is the value of 4(cos^(2)(10^(@))+cos^(2)(50^(@))-sin40^(@)sin80^(@))

Find the values of cos(67""1/2)^(@)

If sin 2 theta = (1)/(2) then what is the value of cos (75^(@)-theta) ?

If sin^(8)theta+cos^(8)theta-1=0 then what is the value of cos^(2)theta sin^(2)theta

The value of cos(67(1^(@))/(2)) is ………….