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EXERCISE 8.1, Choose the correct answer from the given four options:, , 4, 1, Ifcos A= z, then the value of tan Ais, , 5, 3 3 4 2, (A) 3 (B) @ (c) 3 (D) 3, 03/05/18, 90 EXEMPLAR PRORILEMS, . | ., 2, Wsin/ = gr then the value of cot Ais, ' 3, (A 3 ® 4% © F ‘Dy 1, , 3. The value of the expression [cosec (75° + 8) — sec (15° — 6) — an (55° + 8) +, cot (35° — 8)) is, , , , , , , , a, (Ay -i (B) 90 (cy) 1 Mm >, 4. Given thut sind = +. then cos@ is equal to, b a), b yb'-a, (A) ea ®) 7 {c) > (D), $. If cos (@ + B) = 0, then sin (o — B) can be reduced to, (A) cos B (B) cos 28 (Cc) sing (D) sin 2a, 6. The value of (tant® tan2° tan3® ... tan89°) is, 1, (A) 0 (By) ot {C) 2 (D) 2, 7. If cos Sx = sin and 9a < 90" , then the value of tanSct is, 1, (A) B 3 {(c) 1 ~D) 0, 8. If AABC is right angled at C, then the value of cos (A+B) is, Ay 0 B) I co + » 8, (A) ) ) 3 oO), , 9, IfsinA +sit?A = 1, then the value of the expression (cos’A + cus*A) is, , {c) 2 (Dp) 3, , ie, , (A 1 (B), , I 1, 10. Given that sin. = 3 and cosB = >> then the value of (a + fipis, (A (BR) uF (Cc) 60 DM) 9