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�� 23.3. �� :1) sin(2a)/sin(a); 7) (sin^2(a)ctg(a))/sin(2a);2) sin(2a)/(cos^2(a)-sin^2(a)); 8) (sin(a/4)+cos(a/4))(sin(a/4)-cos(a/4));3)...

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23.3. �� :

1) sin(2a)/sin(a); 7) (sin^2(a)ctg(a))/sin(2a);

2) sin(2a)/(cos^2(a)-sin^2(a)); 8) (sin(a/4)+cos(a/4))(sin(a/4)-cos(a/4));

3) cos(2a)+sin^2(a); 9) (sin(a)cos(a))/(1-2sin^2(a));

4) sin(50�)/(2cos(25�)); 10) cos^4(?/4-a)-sin^4(?/4-a);

5) cos(2a)/(cos(a)-sin(a)); 11) ((sin(a)+cos(a))^2-sin(2a))/(cos(2a)+2sin^2(a));

6) 1-2sin^2(a/4); 12) tg(45�+a)/(1-tg^2(45�+a)).

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