4)Given that sin 55degrees = 0.819 and cos20degrees = 0.94,
show how you would use the identities for sin(A+B) and cos(A+B) to find the following:
a) tan 35 degrees
Showing the steps you would follow. NOTE: sin^2theta+cos^2theta=1
4)Given that sin 55degrees = 0.819 and cos20degrees = 0.94,
show how you would use the identities for sin(A+B) and cos(A+B) to find the following:
a) tan 35 degrees
Showing the steps you would follow. NOTE: sin^2theta+cos^2theta=1
I'm not entirely sure why they want you to use the angle sum identities, since there is a shorter way. The denominator cos(35) equals sin(90-35) = sin(55), which is given.
Likewise, the numerator sin(35) = cos(90-35) = cos(55), which is known after using the Pythagorean identity.