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Selina Concise Mathematics Class 9 ICSE Solutions Complementary Angles Selina ICSE Solutions for Class 9 Maths Chapter 25 Complementary Angles Exercise 25(A) 1.(i) Solution 1(i): 1.(ii) Solution 1(ii): 1.(iii) Solution 1(iii): 1.(iv) Solution 1(iv): 1.(v) Solution 1(v): 1.(vi) Solution 1(vi): 1.(vii) Solution 1(vii): 1.(viii) Solution 1(viii): 2.(i) Solution 2(i): 2.(ii) Solution 2(ii): 2.(iii) Solution 2(iii): 2.(iv) Solution 2(iv): 2.(v) Solution 2(v): 2.(vi) Solution 2(vi): 3.(i) Show that: tan 10 °  tan 15 °  tan 75 °  tan 80 °  = 1 Solution 3(i): 3.(ii) Show that: sin 42 °  sec 48 °  +  cos  42 °  cosec 48 °  = 2 Solution 3(ii): 4. Express each of the following in terms of angles between 0°and 45°: ( i ) sin 59°+ tan ...