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Continue Learning about Trigonometry

What is subdominant triad of B major?

There is no such thing as B major. There is B minor and B flat major. The subdominant triad of B minor ( I'm pretty sure) is E minor.


What are five trigonometric identities?

All others can be derived from these and a little calculus: sin2x+cos2x=1 sec2x-tan2x=1 sin(a+b)=sin(a)cos(b)+sin(b)sin(a) cos(a+b)=cos(a)cos(b)-sin(a)sin(b) eix=cos(x)+i*sin(x)


What is tan20tan32 plus tan32tan38 plus tan38tan20?

Oh honey, you're throwing some trigonometry at me? Alright, buckle up. The sum of tan20tan32 plus tan32tan38 plus tan38tan20 is equal to 1. Just plug in those values and watch the magic happen. Math can be sassy too, you know.


In a triangle ABC b equals 15 cm and c equals 25 cm and also angle B equals 32'15'Find the side a and other angles?

By the sine rule, sin(C)/c = sin(B)/b so sin(C) = 25/15*sin(32d15m) = 0.8894 so C = 62.8 deg or 117.2 deg. Therefore, A = 180 - (B+C) = 85.0 deg or 30.5 deg and then, using the sine rule again, a/sin(A) = b/sin(B) so a = sin(A)*b/sin(B) = 28 or a = 14.3


What is the square root of Pythagoras?

Pythagoras was a Classical Greek mathemtician. He gave us the equation. h^(2) = a^(2)+ b^(2) To take the 'square root (sqrt) of this equation we write. sqrt[h^(2)] = sqrt[ a^(2) + b^(2) ] or h = sqrt[a^(2) + b^(2)] Note the use of square brackets to indicate on the RHS that the sum of the squared numbered is square rooted.; NOT the individual numbers. The Pyrthagorean Eq'n refers to Right-Angles triangles. 'h' is the hypotenuse ; the angle opposite the right angle. 'a' & 'b' are the two sides that make up the right angle.