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![youtube - 10 th CBSE Proze thut (1) (1-sin20)sec20 = 1 (1i) (cosec20-1) tan20 = 1 [CBSE 2016] (iii) (sec20 -1)(1 - cosec20) = -1 [CBSE 2015] (iz) sec 0 (1 - sin 0) (sec 0 + tan 0) = 1 [CBSE 20151 Sagar Jhal Classes 10 th CBSE Proze thut (1) (1-sin20)sec20 = 1 (1i) (cosec20-1) tan20 = 1 [CBSE 2016] (iii) (sec20 -1)(1 - cosec20) = -1 [CBSE 2015] (iz) sec 0 (1 - sin 0) (sec 0 + tan 0) = 1 [CBSE 20151 Sagar Jhal Classes - ShareChat](https://cdn4.sharechat.com/bd5223f_s1w/compressed_gm_40_img_981863_1ad68589_1761936980429_sc.jpg?tenant=sc&referrer=pwa-sharechat-service&f=429_sc.jpg "youtube - 10 th CBSE Proze thut (1) (1-sin20)sec20 = 1 (1i) (cosec20-1) tan20 = 1 [CBSE 2016] (iii) (sec20 -1)(1 - cosec20) = -1 [CBSE 2015] (iz) sec 0 (1 - sin 0) (sec 0 + tan 0) = 1 [CBSE 20151 Sagar Jhal Classes 10 th CBSE Proze thut (1) (1-sin20)sec20 = 1 (1i) (cosec20-1) tan20 = 1 [CBSE 2016] (iii) (sec20 -1)(1 - cosec20) = -1 [CBSE 2015] (iz) sec 0 (1 - sin 0) (sec 0 + tan 0) = 1 [CBSE 20151 Sagar Jhal Classes - ShareChat")