SecA+tanA=4 what is the value of CosA
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secA-tanA=4 secA-4 = tanA
→ sec²A + 16-8secA=tan²A
⇒>> sec²A-tan²A +16=8secA
1+16=8secA → 17 =8secA
⇒ secA= 17
8
cos A = 8/17
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