If 6sin theta=5 and cos theta < 0,find ,without a calculate the value of 1-2cos2 theta

Q: evaluate exactly cos-1(-3/2)

A: -3/2 lies outside the domain of the function. Hence we will have no solution

Q: Simplify  1/cos a 1/sin b

A: we know that  1cosθ=secθ1sinθ=cosecθ

Q: epresent 3 sin x + 6 cos x in a form A sin(x + p), use radians for p.

A:

Q: Let sinA=-4/5 with A in QIII and cosB=-3/5 with B in QII. Anwer Exactly. Find sin(A-B), cos(A-B),…

A: Given,

Q: Solve the simplify (sin theta/cos theta) + (1/sin theta)

A:

Q: (7cosx-sinx)2 + (cosx+7sinx)2 = 50 Verify the identity.

A: Given,

Q: evaluate exactly sin(cos-1(2/3))

A:

Q: Evaluate V2 cos sin-! 2.

A:

Q: evaluate cos theta when sin theta = -7/8 and theta is in the IV quadurant.

A:

Fundamentals of Trigonometric Identities

Trigonometric Identities are the equalities that involve trigonometry functions and hold for all the values of variables given in the equation.