A) sin30cos60-sin^2 45
B) 2cos180-sin ^2 270
C) cos30sin60+cos^2 45
D)3sin90-cos^2 0
B) 2cos180-sin ^2 270
C) cos30sin60+cos^2 45
D)3sin90-cos^2 0
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Answers & Comments
b) 2 cos180 - sin²270=2*(-1)-(-1)^2= -2-1=-3
с)cos30*sin60+cos2 45 =1целая 1/4
д)--------