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20. cosee dcot A - sec tan - (cot 4-1an 4)(see Acosee A-1y 41 2 2) 1 3)-1 cos A+sin'A cos' 1-sin' A ces

 

20. cosee" dcot A - sec tan - (cot 4-1an 4)(see Acosee A-1y 41 2 2) 1 3)-1 cos A+sin'A cos' 1-sin' A ces -sin A me then & 21. cos+ sin 4) -1 2) I 3) 2 2sin I- cose+sind then I+casti+ sin e is equal to 22 1= 2) 1-x 3) * 4) 1 1) +x 23. sin 1 tsin 20 + sin 30 ttsin 360= 1) 0 2)1 3) -1 4) 2 24. sin (51"-x) + sin' (39+x= 2) 0 3) 1 4) 2 25. con(125-x)- cus (55 210 3) 1 4) 2 26. 1f 3 tee complenentury angles and sin= 3 then sintacos- coN sin 3- 25 1) 25 2) 25 4) 27. Which of the following is correct L) Sinl> sin1 2) Sinl

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