ICSE Class 9 Maths Trigonometry

• In a triangle ABC, show that : tan B+C/2 = cot A/2
• ch coplementary angles show that tan(45+A) tan(45-A)=1
• sin27/coss63  
  
• A triangle ABC is right angled at B;find the value of secA. SinC- tanA. TanC /sinB
• 2tan11°tan31°tan45°tan59°tan79°

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