17. sin (45 + 0) - cos (45 - 0) is ...
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17. sin (45 + 0) - cos (45 - 0) is (1) 2 sine (2) 1 (3) 2 cos (4) O

11th - 12th Class
Maths
Solution
143
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17. ( (4) sin (45+theta)-cos (45-theta) ) ( =cos left(90^{circ}-(45+theta)-cos right. ) ( (45-theta) ) ( left[because cos left(90^{circ}-thetaright)=sin thetaright] ) ( =cos (45-theta)-cos (45-theta)=0 )
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