`cos5^0+cos2 4^0+cos17 5^0+cos20 4^0+cos30 0^0=` 1) `1/2` 2) 1 3) `3/2` 4)2

cos1^(0)cos2^(0)...cos179^(@)

The value of cos^2 10^0-cos10^0cos50^0+cos^2 50^0 is equal to 4/3 (b) 1/3 (c) 3/4 (d) 3

The value of cos^2 10^0-cos10^0cos50^0+cos^2 50^0 is equal to 4/3 (b) 1/3 (c) 3/4 (d) 3

cos1^(0)+cos2^(0)+cos3^(0)+ . . .+cos180^(0) =

If 0 cos x + cos 2x + cos 3x + cos 4x = 0 ;

The value of cos 52^0+cos 68^0+cos 172^0 is a. 0 b. 1 c. 2 d. 3//2

5. cos^(2)(125^(0)-x)-cos^(2)(55^(0)+x) = (1) -1 (2) 0 (3) 1 (4) 2

cos20^0+cos80^0-sqrt(3)cos50^0 p. -1 cos0^0+cospi/7+cos(2pi)/7+cos(3pi)/7+cos(4pi)/7+cos(5pi)/7+cos(6pi)/7 q. -3/4 cos20^0+cos40^0+cos60^0-4cos10^0cos20^0cos30^0 r. 1 cos20^0cos100^0+cos100^0cos140^0-cos140^0cos200^0 s. 0

cos4 0^(@)+cos2 0^(@))=3(cos1 0^(@)+sin2 0^(@)) 40 CUSOUcos 40^@ + cos 20O 4(cos310^@ + sin320^@) = 3(cos 10^@ + sin20^@)N3.1 = 4