Q5 of 268 Page 4

If cos 47^o=a, then express sin 43^o in terms of a.

Given cos 47° = a

We know that cos θ = sin (90° - θ)

Here, θ = 47°

⇒ sin (90° - 47°) = a

⇒ sin 43° = a

If A+B=90^o, then fill up the blanks with suitable trigonometric ratio of complementary angle of A or B.

(i) sin A =…. (ii) cos B =…

(iii) sec A =… (iv) tan B =…

(v) cosec B =… (vi) cot A=…

If sin 37^o=a, then express cos 53^o in terms of a.

If sin 52^o=a, then express sin 38^o in terms of a.

If sin 56^o=x, then express sin 34^o in terms of x.

If cos 47o=a, then express sin 43o in terms of a.