Use the formula cos (A + B) = cos (A) cos (B)-sin (A) sin (B) Now, cos (75 °) can be written as cos (30 ° + 45 °) Substituting the values in the formula, cos (75 °) = cos (30 °) cos (45 °)-sin (30 °) sin (45 °) ⇒ cos (75 °) = 3 2 · 1 2-1 2 · 1 2 ⇒ cos (75 °) = 3-1 2 2 ⇒ cos (75 °) = 3-1 × 2 2 2 2 × 2 2 ⇒ cos (75 °) = 2 6 ...

Sep 15, 2015 · How do you use the half angle identity to find exact value of cos 75 degrees? Trigonometry Trigonometric Identities and Equations Half-Angle Identities 1 Answer

Dec 6, 2014 · #75^o# can be made of the sum of #45^o# and #30^o#, both of which are on the unit circle! #cos(75^o) = cos(45^o + 30^o) # Using our sum identity, where #alpha = 45^o# and #beta = 30^o#; #=cos(45^o)cos(30^o) - sin(45^o)sin(30^o)# Now just find these values on your unit circle and you get; #=sqrt(2)/2 xxsqrt(3)/2 - sqrt(2)/2 xx 1/2#

We use sin, cos, and tan functions to calculate the angles. The degrees used commonly are 0, 30, 45, 60, 90, 180, 270 and 360 degrees. We use these degrees to find the value of the other trigonometric angles like the value of sine 15 degrees.

Express sin 67° + cos 75° in terms of trigonometric ratios of angles between 0° and 45°. Q. Question 7 Express s i n 67 ∘ + c o s 75 ∘ in terms of trigonometric ratios of angles between 0 ∘ and 45 ∘ .

In trigonometry formulas, we will learn all the basic formulas based on trigonometry ratios (sin,cos, tan) and identities as per Class 10, 11 and 12 syllabi. Also, find the downloadable PDF of trigonometric formulas at BYJU'S.

Applying trigonometric identities : tan A = sin A cos A and c o t A = cos A sin A, we get : tan 75 °-cot 75 ° = sin 75 ° cos 75 °-cos 75 ° sin 75 ° = sin 2 75 °-cos 2 75 ° cos 75 ° sin 75 ° Step-2 : Finding the value of sin 2 75 °-cos 2 75 ° applying the trigonometric identity cos 2 A = cos 2 A-sin 2 A. We have, sin 2 75 °-cos 2 75 ...

Q. Express cot 85 ∘ + cos 75 ∘ in terms of trigonometric ratios of angles between 0 ∘ and 45 ∘. Q. Question 7 Express s i n 67 ∘ + c o s 75 ∘ in terms of trigonometric ratios of angles between 0 ∘ and 45 ∘ .

Express sin 67° + cos 75° in terms of trigonometric ratios of angles between 0° and 45°. Q. Express each of the following in terms of trigonometric ratios of angles lying between 0° and 45°.

Dec 11, 2016 · How do you use the sum and difference identities to find the exact value of cos 75?