Tuesday

March 31, 2015

March 31, 2015

Posted by **adil ahmed** on Wednesday, December 2, 2009 at 6:50pm.

cos2x=1-sinx

also cosx=cosx-1

and please also sin2x=3sinx

- maths please answer NOW!!!!! -
**bobpursley**, Wednesday, December 2, 2009 at 6:57pmIsn't cos2x=cos^2x-sin^2x=1-2sin^2 x ?

put that into the left side, gather terms, and you have a quadratic equation.

The second makes no sense.

**Answer this Question**

**Related Questions**

Trigonometry - Simplify #1: cscx(sin^2x+cos^2xtanx)/sinx+cosx = cscx((1)tanx)/...

Math 12 - Simplify #1: cscx(sin^2x+cos^2xtanx)/sinx+cosx = cscx((1)tanx)/sinx+...

Trig - Verify the identity: tanx(cos2x) = sin2x - tanx Left Side = (sinx/cosx)(...

Math - Verify the identity . (cscX-cotX)^2=1-cosX/1+cosX _______ sorry i cant ...

Trigonometry. - ( tanx/1-cotx )+ (cotx/1-tanx)= (1+secxcscx) Good one! ...

Trig........ - I need to prove that the following is true. Thanks (cosx / 1-sinx...

Pre-Calc - Trigonometric Identities Prove: (tanx + secx -1)/(tanx - secx + 1)= ...

Trigonometry Check - Simplify #3: [cosx-sin(90-x)sinx]/[cosx-cos(180-x)tanx] = [...

check math - Here are my answers. Can you check if I got the right answers? ...

Calculus - If y=3/(sinx+cosx) , find dy/dx A. 3sinx-3cosx B. 3/(sinx+cosx)^2 C...