2017年11月17日 · tan(45^@)=1 sin(45^@)=sqrt2/2 cos(45^@)=sqrt2/2 45^@ is a special angle, along with 30^@, 60^@, 90^@, 180^@, 270^@, 360^@. tan(45^@)=1 sin(45^@)=sqrt2/2 cos(45 ...

2015年9月12日 · In this case both the other two angles would be 45 degrees each. Now, if both its legs are considered of unit length, then hypotenuse would be of length #sqrt2# . The #cos 45 =1/sqrt2= sqrt2 /2#

cos 45^@ = sqrt(2)/2 The double angle formula for cos can be written: cos 2theta = cos^2 theta - sin^2 theta = 2cos^2 theta - 1 Given: cos 90^@ = 0 Let theta = 45^@ to get: 0 = cos 90^@ = 2cos^2 45^@-1 Add 1 to both ends to get: 1 = 2cos^2 45^@ Divide both sides by 2 and transpose to find: cos^2 45^@ = 1/2 Hence: cos 45^@ = +-sqrt(1/2) = +-sqrt(2/4) = +-sqrt(2)/2 Now 45^@ is in Q1, so cos 45 ...

2017年1月26日 · Solution: x=0^0 cos(x+45) + cos (x-45) =sqrt2 or cos x cos 45 cancel(- sinx sin45) + cosx cos45 cancel(+sinx sin45)=sqrt2 or 2 cosx cos45 =sqrt 2 or 2cosx *1/sqrt2 =sqrt 2 or 2 cos x =2 or cos x =1 ; cos 0 =1 :.x=0^0 Solution: x=0^0 [Ans]

2015年5月3日 · Trig conversion table gives: cos 45 = (sqr2)/2 -> sec 45 = 1/cos 45 = 2/(sqr2) sin 45 = (sqr2)/2 -> csc 45 = 1/sin 45 = 2/(sqr2)

Question 180731: Show that the values are equal. sin^2 60 degrees + cos^2 60 degrees=sin^2 45 degrees + cos^2 45 degrees

Question 882479: cos^2 30°×cos^2 45°+4sec^2 60°+1/2cos^2 90°-2×tan^2 60° Answer by ewatrrr(24785) ( Show Source ): You can put this solution on YOUR website!

2016年11月20日 · General Formula: #color(white)("XXX")cos(A+B)=cos(A) * cos(B) - sin(A) * sin(B)# Note: #75^@ = 30^@ +45^@# #30^@# and #45^@# are two of the standard angles with:

How do you write #cos^2 0.45-sin^2 0.45# as a single trigonometric function? Question #e375a. Question #4eece.

You can put this solution on YOUR website! Prove that cos(A+B) + sin(A-B) = 2sin(45°+A)cos(45°+B) I will simplify the right side until it becomes the left side ...