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Sahay Sir > Question Answers > NCERT Class 10 > Maths > Chapter 8 - Introduction to Trigonometry > State whether the following are true or false. Justify your answer. .(i) sin (A + B) = sin A + sin B. (ii) The value of sin θ increases as θ increases. (iii) The value of cos θ increases as θ increases. (iv) sin θ = cos θ for all values of θ. (v) cot A is not defined for A = 0°

State whether the following are true or false. Justify your answer. .(i) sin (A + B) = sin A + sin B. (ii) The value of sin θ increases as θ increases. (iii) The value of cos θ increases as θ increases. (iv) sin θ = cos θ for all values of θ. (v) cot A is not defined for A = 0°

Evaluate the following: (iv) (sin 30 + tan 45 - cosec 60) / (sec 30 + cos 60 + cot 45)