CBSE Class 11-science Maths Introduction to Trigonometric Functions

• clear this doubt
  
• If A+B+C=pi , then equality of equation (1/2)(cosA cosB + cosB cosC + cosC cosA) must hold: a) <= 3/2.   b) >=(-3)   c) <=3/8   d) >=(-1)  
• Q10
  
• Solve question no-4
  
• If the value of cosec x repeats after an interval of 2,then what is the value of cosec(7/6)?
• Find the value of -cos(30)
• Pls solve.
  
• Pls solve
  
• What is trigonometry  
• in a right angled triangle the hypotenuse is 2root2 times the perpendicular drawn from  the opposite vertex then then other acute angles of triangle are   

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