Plane Trigonometry |
From inside the book
Results 1-5 of 82
Page 23
... Prove that √sec2 A + cosec2 A = tan A + cot A. We have seen that and so that sec2 A = 1 + tan2 A , cosec2 4 = 1 + cot2 A. .. sec2 A + cosec2 A tan2 A + 2 + cot2 A = tan2 A + 2 tan △ cot A + cot2 A = ( tan A + cot A ) 2 , √sec2 4 + ...
... Prove that √sec2 A + cosec2 A = tan A + cot A. We have seen that and so that sec2 A = 1 + tan2 A , cosec2 4 = 1 + cot2 A. .. sec2 A + cosec2 A tan2 A + 2 + cot2 A = tan2 A + 2 tan △ cot A + cot2 A = ( tan A + cot A ) 2 , √sec2 4 + ...
Page 63
... prove that tan 0- 2mn + 2n2 ' 6. If prove that 7. Prove that 8. Express in terms of tan A. cosecб a cos - sin 0/2 sin 0 , cos 0+ sin 0/2 cos 0 . = cots a = 3 cosec2 a cot2 a +1 . 2 sec2 A - sec4 A - 2 cosec2 4 + cosec1 A 9. Solve the ...
... prove that tan 0- 2mn + 2n2 ' 6. If prove that 7. Prove that 8. Express in terms of tan A. cosecб a cos - sin 0/2 sin 0 , cos 0+ sin 0/2 cos 0 . = cots a = 3 cosec2 a cot2 a +1 . 2 sec2 A - sec4 A - 2 cosec2 4 + cosec1 A 9. Solve the ...
Page 74
... Prove that 1. sin 420 ° cos 390 ° + cos ( − 300 ° ) sin ( — 330 ° ) = 1 . 2 . cos 570 ° sin 510 ° - sin 330 ° cos 390 ° = 0 . and 3. tan 225 ° cot 405 ° + tan 765 ° cot 675 ° = 0 . What are the values of cos A- sin A and tan A + cot A ...
... Prove that 1. sin 420 ° cos 390 ° + cos ( − 300 ° ) sin ( — 330 ° ) = 1 . 2 . cos 570 ° sin 510 ° - sin 330 ° cos 390 ° = 0 . and 3. tan 225 ° cot 405 ° + tan 765 ° cot 675 ° = 0 . What are the values of cos A- sin A and tan A + cot A ...
Page 84
... prove that 0 = 2mπ + a + ẞ or else that 0 = ( 2m + 1 ) π + a - ẞ where m and n are any integers . Π 28. If cos p0 + cos q0 = 0 , prove that the different values of form two arithmetical progressions in which the common differences are ...
... prove that 0 = 2mπ + a + ẞ or else that 0 = ( 2m + 1 ) π + a - ẞ where m and n are any integers . Π 28. If cos p0 + cos q0 = 0 , prove that the different values of form two arithmetical progressions in which the common differences are ...
Page 89
... prove the truth of the theorems when either or both of the component angles have values between 0 ° and 270 ° . By proceeding in this way we see that the theorems are true uni- versally . and 90. Theorem . To prove that sin A cos B ...
... prove the truth of the theorems when either or both of the component angles have values between 0 ° and 270 ° . By proceeding in this way we see that the theorems are true uni- versally . and 90. Theorem . To prove that sin A cos B ...
Other editions - View all
Common terms and phrases
a+b+c a+ẞi A₁ ad inf angle AOP angle of elevation Binomial Theorem centre circle circumcircle coefficient complex quantity cos¹ cos² cos³ cosec cosh cosine cotangent denoted Diff distance equal EXAMPLES expression feet Find the angle find the height find the values flagstaff given log Hence infinite inscribed integer last article length loga logarithm loge miles multiple nearly number of radians pedal triangle perpendicular places of decimals principal value prove quadrant quadrilateral r₁ radius regular polygon revolving line right angle sec² secant shew shewn sides Similarly sin sin sin sin¹ sin² sin³ sine sinh tan-¹ tan² tan³ tangent tanh Theorem tower triangle ABC trigonometrical functions trigonometrical ratios unity x+yi zero α α π π
Popular passages
Page 36 - ... the three angles of a triangle are together equal to two right angles, although it is not known to all.
Page 17 - Radian is the angle subtended, at the centre of a circle, by an arc equal in length to the radius...
Page 44 - A person standing on the bank of a river observes that the angle subtended by a tree on the opposite bank is 50°; walking 40 ft.
Page 13 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sidef.
Page 1 - Every circumference of a. circle, whether the circle be large or small, is supposed to be divided into 360 equal parts called degrees. Each degree is divided into 60 equal parts called minutes, and each minute into 60 equal parts called seconds.
Page 10 - If the radius of the earth be 4000 miles, what is the length of its circumference?
Page 42 - From the top of a cliff 150 ft. high the angles of depression of the top and bottom of a tower are 30° and 60°, respectively.
Page 220 - A ladder placed at an angle of 75° just reaches the sill of a window at a height of 27 feet above the ground on one side of a street. On turning the ladder over without moving its foot, it is found that when it rests against a wall on the other side of the street it is at an angle of 15° with the ground.
Page 215 - From the top of a hill the angles of depression of two objects situated in the...