Use identities to find values of the sine and cosine functions of the function for the angle measurea. theta, given that cos2theta=28/53 and 0theta < theta < 90degreesb. 2theta, given sin theta= - sqrt 7 over 5 and cos theta > 0c. 2x, given tan x=2 and cos x<0

I don't know what the answer is I wish I could help

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step-by-step explanation:

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proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc