tan33A-tan22A-Tan11A=tan33A.tan22A.tan11A
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tan33A=tan (22A+11A)
=(tan22A+tan11A)/(1-tan22A.tan11A)
=>tan33A(1-tan22A.tan11A)=tan22A+tan11A
=>tan33A-tan33A. tan22A. tan11A=tan22A+tan11A
=> tan33A-tan22A-tan11A=tan33A.tan22A. tan11A
tan33A=tan (22A+11A)
=(tan22A+tan11A)/(1-tan22A.tan11A)
=>tan33A(1-tan22A.tan11A)=tan22A+tan11A
=>tan33A-tan33A. tan22A. tan11A=tan22A+tan11A
=> tan33A-tan22A-tan11A=tan33A.tan22A. tan11A
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tan 33a - tan 22a- tan 11a =tan 33a. tan 22a.tan 11a.
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