Question #b9d80 Trigonometry Right Triangles Relating Trigonometric Functions 1 Answer P dilip_k Feb 27, 2017 #sin 495°=1/(√2)# #=>sin(90xx5+45)°=1/(√2)# #=>cos45=1/sqrt2# #sin375=sin(90xx4+15)=sin15# #=sin(60-45)=sin60cos45-cos60sin45# #=sqrt3/2xx1/sqrt2-1/2xx1/sqrt2# #=(sqrt3-1)/(2sqrt2)# Answer link Related questions What does it mean to find the sign of a trigonometric function and how do you find it? What are the reciprocal identities of trigonometric functions? What are the quotient identities for a trigonometric functions? What are the cofunction identities and reflection properties for trigonometric functions? What is the pythagorean identity? If #sec theta = 4#, how do you use the reciprocal identity to find #cos theta#? How do you find the domain and range of sine, cosine, and tangent? What quadrant does #cot 325^@# lie in and what is the sign? How do you use use quotient identities to explain why the tangent and cotangent function have... How do you show that #1+tan^2 theta = sec ^2 theta#? See all questions in Relating Trigonometric Functions Impact of this question 1244 views around the world You can reuse this answer Creative Commons License