Wednesday

September 17, 2014

September 17, 2014

Posted by **pooja** on Saturday, April 30, 2011 at 7:53am.

- maths -
**MathMate**, Saturday, April 30, 2011 at 9:43amExpand both sides using sum of angles formula:

cos(a+b)=cos(a)cos(b)-sin(a)sin(b)

cos(a-b)=cos(a)cos(b)+sin(a)sin(b)

Divide by cos(a) on both sides and solve for tan(a) to get:

tan(a)=cot(b)*(1-m)/(1+m)

Check me.

**Answer this Question**

**Related Questions**

Trig - Given: cos u = 3/5; 0 < u < pi/2 cos v = 5/13; 3pi/2 < v < ...

precalculus - For each of the following determine whether or not it is an ...

Trig. - sec^2xcotx-cotx=tanx (1/cos)^2 times (1/tan)-(1/tan)=tan (1/cos^2) times...

Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...

Trigonometry desperate help, clueless girl here - 2. solve cos 2x-3sin x cos 2x...

trig - Show that 1-cos2A/Cos^2*A = tan^2*A 1-cos2A/Cos^2*A = [Cos^2(A) - Cos(2A...

Trigonometry - Please review and tell me if i did something wrong. Find the ...

calculus - Differentiate. y= (cos x)^x u= cos x du= -sin x dx ln y = ln(cos x)^x...

Calc. - Differentiate. y= (cos x)^x u= cos x du= -sin x dx ln y = ln(cos x)^x ln...

Math - Prove each identity: a) 1-cos^2x=tan^2xcos^2x b) cos^2x + 2sin^2x-1 = sin...