Let us determine the values of :sin245° – cosec260° + sec230°

⇒ ⇒ ⇒ ⇒ sin245 – cosec260 + sec230= = =

Q5 of 80 Page 302

Let us determine the values of :
sin²45° – cosec²60° + sec²30°

⇒

⇒ sin²45 – cosec²60 + sec²30

In a right angled triangle ABC, ∠B=90°, ∠A=30° and AC = 20 cm. Let us determine the lengths of two sides BC and AB.

In a right angled triangle PQR, ∠Q=90°, ∠R=45°; if PR = 3√2, then let us find out the lengths of two sides PQ and QR.

Let us determine the values of :

sec²45° – cot²45° + sin²30° – sin²60°

Let us determine the values of :

Questions · 80

23. Trigonometric Ratios and Trigonometric Identities

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