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  2. socratic.org › questions › what-is-cos-90What is cos(θ-90)? - Socratic

    Jun 17, 2018 · What is cos(θ-90)? Trigonometry. 1 Answer Jim G. Jun 17, 2018 #sintheta# Explanation: #"using the "color ...

  3. socratic.org › questions › why-does-cos-90-x-sin-x-and-sin-90-x-cos-xWhy does #cos(90 - x) = sin(x)# and #sin(90 - x) = cos(x)#? -...

    Apr 17, 2015 · Note that the image below is only for x in Q1 (the first quadrant). If you wish you should be able to draw it with x in any quadrant. Definition of sin(x) (side opposite angle x)//(hypotenuse) Definition of cos(90^@ -x) (side adjacent to angle (90^@-x))//(hypotenuse) but (side opposite angle x) = (side adjacent to angle (90^@-x) Therefore sin(x) = cos(90^@ -x) Similarly cos(x) = sin(90^@ - x)

  4. brainly.in › question › 4449879What is the value of cos^2(90°)? - Brainly

    Jun 30, 2018 · Find the difference of areas of sector of angle 90 °, and its corresponding major sector of the circle of radius 21cm. One end P of a line PQ, 80 mm long, is 10 mm above HP and 15 mm in front of VP. The line is inclined at 400 to HP, and the top view of the line is mak …

  5. socratic.org › questions › how-do-you-prove-cos-90-a-sin-aHow do you prove cos(90°-a) = sin(a)? - Socratic

    Sep 18, 2016 · See the Proof in Explanation Section. We will use the following Expansion Formula : cos(A-B)=cosAcosB+sinAsinB. Let A=90^@, and =a. Therefore. cos(90^@-a)=cos90^@cosa+sin90^@sina. Here, we have, cos90^@=0, sin90^@=1. :. cos(90^@-a)=sina.

  6. brainly.in › question › 27720770the value of cos(90 - x) cos(90 - y)-sin(90 - y) - Brainly.in

    Nov 5, 2020 · Answer:-cos (x+y) Step-by-step explanation: cos(90-x) = sin x. cos(90-y) = sin y. sin(90-x) = cos x. sin(90-y) = cos y

  7. socratic.org › questions › what-is-sin-x-90What is #sin(x-90)#? - Socratic

    Dec 17, 2015 · Use the sine angle subtraction formula: #sin(alpha-beta)=sin(alpha)cos(beta)-cos(alpha)sin(beta)# Therefore, #sin(x-90˚)=sin(x)cos(90˚)-cos(x)sin(90˚)#

  8. brainly.in › question › 10080312(ii) cos 90° + cos2 45° sin 30° tan 45º. - Brainly.in

    May 29, 2019 · Hey ️. cos 90° + cos 45°² sin 30° tan 45º. OR (SINCE THE QUESTION ISN'T FRAMED WELL) cos 90° + 2.cos 45° .sin 30° .tan 45º

  9. brainly.in › question › 14602299If cos (90-A)=sin 60 then find A - Brainly

    Jan 9, 2020 · Step-by-step explanation: By using trigonometric identities. cos ( 90 - A) = sin A. hence A = 60. hope you Understand study well

  10. brainly.in › question › 1071886cos(90-A) sec(90-A)tanA/ cosec(90-A) sin(90-A) cot(90-A)+...

    Jan 27, 2017 · Find an answer to your question cos(90-A) sec(90-A)tanA/ cosec(90-A) sin(90-A) cot(90-A)+ tan(90-A)/ cot A=2 spriyasmerlet spriyasmerlet 27.01.2017

  11. brainly.in › question › 1590352If x sin(90°-A)cot(90°-A) = cos(90°-A), then x - Brainly

    Oct 13, 2017 · Xsin(90 -A)cot(90-A)=cos(90-A) x.cosA.tanA=sinA x=1 Because if you take cosA to right side then it will convert into tanA by dividing with sinA so ,now tanA on both side will be cancel out .And You get x=1

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