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Simplify.

cosx/secx−secxcosx

 Apr 4, 2022
 #1
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+1

Remember the defintion of sec = 1/cos

 

so this becomes     cos / ( 1/cos)  - 1/cos * cos

                                    cos^2   - 1        

                                 (1-sin^2)  - 1   =   - sin^2  

 Apr 4, 2022

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